This list includes plants native and introduced to the state of

Ohio Ohio () is a state in the Midwestern region of the United States. Of the fifty U.S. states, it is the 34th-largest by area, and with a population of nearly 11.8 million, is the seventh-most populous and tenth-most densely populated. The sta ...

, designated (N) and (I), respectively. Varieties and subspecies link to their parent species.

A

* ''Abies balsamea'' var. ''balsamea'' (I) *''

Abutilon theophrasti ''Abutilon theophrasti'' (velvetleaf, velvet plant, velvetweed, Chinese jute, China jute, crown weed, buttonweed, lantern mallow, butterprint, pie-marker, or Indian mallow) is an annual plant in the family Malvaceae, native to southern Asia. It ...

'' (I) *''

Acalypha deamii ''Acalypha'' is a genus of flowering plants in the family Euphorbiaceae. It is the sole genus of the subtribe Acalyphinae. It is one of the largest euphorb genera, with approximately 450 to 462 species. The genus name ''Acalypha'' is from th ...

'' (N) *'' Acalypha gracilens'' (N) *'' Acalypha ostryifolia'' (N) *'' Acalypha rhomboidea'' (N) *'' Acalypha virginica'' (N) *''

Acer campestre ''Acer campestre'', known as the field maple, is a flowering plant species in the family Sapindaceae. It is native to much of continental Europe, Britain, southwest Asia from Turkey to the Caucasus, and north Africa in the Atlas Mountains. It has ...

'' (I) *'' Acer × freemanii'' (N) *'' Acer ginnala'' (I) * ''Acer negundo'' var. ''negundo'' (N) * ''Acer negundo'' var. ''violaceum'' (N) *''

Acer nigrum ''Acer nigrum'', the black maple, is a species of maple closely related to '' A. saccharum'' (sugar maple), and treated by some authors as a subspecies of it, as ''Acer saccharum'' subsp. ''nigrum''. Identification can be confusing due to the ...

'' (N) *''

Acer palmatum ''Acer palmatum'', commonly known as Japanese maple, palmate maple, or smooth Japanese maple (Japanese: ''irohamomiji'', , or ''momiji'', (栴), is a species of woody plant native to Japan, Korea, China, eastern Mongolia, and southeast Russi ...

'' (I) *'' Acer pensylvanicum'' (N) *''

Acer platanoides ''Acer platanoides'', commonly known as the Norway maple, is a species of maple native to eastern and central Europe and western Asia, from Spain east to Russia, north to southern Scandinavia and southeast to northern Iran. It was introduced to ...

'' (I) * ''Acer rubrum'' var. ''rubrum'' (N) * ''Acer rubrum'' var. ''trilobum'' (N) *''

Acer saccharinum ''Acer saccharinum'', commonly known as silver maple, creek maple, silverleaf maple, soft maple, large maple, water maple, swamp maple, or white maple, is a species of maple native to the eastern and central United States and southeastern Canad ...

'' (N) * ''Acer saccharum'' var. ''saccharum'' (N) *''

Acer spicatum ''Acer spicatum'', the mountain maple, dwarf maple, moose maple, or white maple, is a species of maple native to northeastern North America from Saskatchewan to Newfoundland, and south to Pennsylvania. It also grows at high elevations in the sout ...

'' (N) *'' Acer tataricum'' (I) * ''Achillea millefolium'' var. ''occidentalis'' (N) * ''Achillea millefolium'' var. ''millefolium'' (I) *''

Achillea ptarmica ''Achillea ptarmica'' is a European species of herbaceous perennial flowering plant in the genus ''Achillea'' of the daisy family Asteraceae. Common names include the sneezewort, sneezeweed, bastard pellitory, European pellitory, fair-maid-of-Fr ...

'' (I) * ''Achyranthes japonica'' var. ''hachijoensis'' (I) *''

Acinos arvensis ''Acinos arvensis'', known commonly as basil thyme and spring savory, is a species of plant of the genus ''Acinos''. It is a perennial that usually grows about high and spreads . It prefers to grow in strong sunlight. The scent is faintly remin ...

'' (I) *''

Aconitum noveboracense ''Aconitum noveboracense'', also known as northern blue monkshood or northern wild monkshood, is a flowering plant belonging to the buttercup family (Ranunculaceae). Members of its genus ('' Aconitum'') are also known as wolfsbane. The United ...

'' (N) * ''Aconitum uncinatum'' ssp. ''uncinatum'' (N) *''

Acorus americanus ''Acorus americanus'', the American sweet flag, is an emergent wetland plant native to the northern United States and Canada. This perennial plant has bright green blade-shaped leaves that arise directly from the rhizomes and sheath into each ot ...

'' (N) *''

Acorus calamus ''Acorus calamus'' (also called sweet flag, sway or muskrat root, among many common names) is a species of flowering plant with psychoactive chemicals. It is a tall wetland monocot of the family Acoraceae, in the genus ''Acorus.'' Although us ...

'' (I) *''

Acroptilon repens ''Rhaponticum repens'', synonym ''Acroptilon repens'', with the common name Russian knapweed, is a bushy rhizomatous perennial, up to 80 cm tall. Stems and leaves are finely arachnoid-tomentose becoming glabrous and green with age. The rosette le ...

'' (I) *''

Actaea pachypoda ''Actaea pachypoda'', the white baneberry or doll's-eyes, is a species of flowering plant in the genus ''Actaea'', of the family Ranunculaceae. The plant is native to eastern North America, in eastern Canada, and the Midwestern and Eastern Unit ...

'' (N) * ''Actaea racemosa'' var. ''racemosa'' (N) * ''Actaea rubra'' ssp. ''rubra'' (N) *'' Actinidia arguta'' (I) *''

Adenocaulon bicolor ''Adenocaulon bicolor'', the American trailplant, trailplant, pathfinder, or silver-green, is a flowering plant in the family Asteraceae, native to North America. It is found in southern Canada and across the northern and western United States. I ...

'' (N) *''

Adiantum capillus-veneris ''Adiantum capillus-veneris'', the Southern maidenhair fern, black maidenhair fern, maidenhair fern, and venus hair fern, is a species of ferns in the genus ''Adiantum'' and the family Pteridaceae with a subcosmopolitan worldwide distribution. I ...

'' (N) *''

Adiantum pedatum ''Adiantum pedatum'', the northern maidenhair fern or five-fingered fern, is a species of fern in the family Pteridaceae, native to moist forests in eastern North America. Like other ferns in the genus, the name maidenhair refers to the slender, ...

'' (N) *''

Adlumia fungosa ''Adlumia fungosa'' is a species in the Papaveraceae that is commonly known as the Allegheny vine, climbing fumitory, or mountain fringe. It is a herbaceous, creeping, flowering plant and is closely related to the Fumitory genus, ''Fumaria''. '' ...

'' (N) *''

Aegilops cylindrica ''Aegilops cylindrica'', also known as jointed goatgrass. is an annual grass seed that is part of the tribe Triticeae, along with wheat and some other cereals. It is not native to North America, however it has become a serious issue as a weed si ...

'' (I) *''

Aegopodium podagraria ''Aegopodium podagraria'', commonly called ground elder, is a species of flowering plant in the carrot family Apiaceae that grows in shady places. The name "ground elder" comes from the superficial similarity of its leaves and flowers to those o ...

'' (I) *''

Aesculus flava ''Aesculus flava'', the yellow buckeye, common buckeye, or sweet buckeye, is a species of deciduous tree. It is native to the Ohio Valley and Appalachian Mountains of the Eastern United States. It grows in mesophytic forest or floodplains, genera ...

'' (N) * ''Aesculus glabra'' var. ''glabra'' (N) *''

Aesculus hippocastanum ''Aesculus hippocastanum'', the horse chestnut, is a species of flowering plant in the maple, soapberry and lychee family Sapindaceae. It is a large, deciduous, synoecious (hermaphroditic-flowered) tree. It is also called horse-chestnut, Europ ...

'' (I) *'' Aesculus × marylandica'' (N) *''

Aethusa cynapium ''Aethusa cynapium'' (fool's parsley, fool's cicely, or poison parsley) is an annual (rarely biennial) herb in the flowering plant family Apiaceae, native to Europe, western Asia, and northwest Africa. It is the only member of the genus ''Aethus ...

'' (I) *''

Agalinis auriculata ''Agalinis auriculata'' is a species of flowering plant in the family Orobanchaceae known as earleaf false foxglove, auriculate false foxglove, and earleaf gerardia. It is endemic to the United States, where it occurs from New Jersey west to Minn ...

'' (N) *''

Agalinis gattingeri ''Agalinis gattingeri'', the roundstem false foxglove, is an annual hemiparasitic forb measuring between 10.5 and 60.5 cm in height. Description ''Agalinis gattingeri'' is an annual species with upright, slender, round stems which are hai ...

'' (N) * ''Agalinis paupercula'' var. ''borealis'' (N) * ''Agalinis paupercula'' var. ''paupercula'' (N) *''

Agalinis purpurea ''Agalinis purpurea'' (known by common names including purple false foxglove and purple gerardia) is an annual forb native to the eastern United States and Canada, USDA, NRCS. 2014. The PLANTS Database (http://plants.usda.gov). National Plant Dat ...

'' (N) *''

Agalinis skinneriana ''Agalinis skinneriana'' is a species of flowering plant in the family Orobanchaceae known by the common names Skinner's gerardia, Skinner's false foxglove and pale false foxglove. It is native to North America, where it occurs in Ontario south ...

'' (N) * ''Agalinis tenuifolia'' var. ''macrophylla'' (N) * ''Agalinis tenuifolia'' var. ''parviflora'' (N) * ''Agalinis tenuifolia'' var. ''tenuifolia'' (N) *'' Agastache nepetoides'' (N) *'' Agastache scrophulariifolia'' (N) * ''Ageratina altissima'' var. ''altissima'' (N) * ''Ageratina aromatica'' var. ''aromatica'' (N) *''

Agrimonia eupatoria ''Agrimonia eupatoria'' is a species of agrimony that is often referred to as common agrimony, church steeples or sticklewort. The whole plant is dark green with numerous soft hairs. The soft hairs aid in the plant's seed pods sticking to any a ...

'' (I) *''

Agrimonia gryposepala ''Agrimonia gryposepala'' (commonly known as tall hairy agrimony,Agrimonia microcarpa ''Agrimonia'' (from the Greek ), commonly known as agrimony, is a genus of 12–15 species of perennial herbaceous flowering plants in the family Rosaceae, native to the temperate regions of the Northern Hemisphere, with one species also in A ...

'' (N) *''

Agrimonia parviflora ''Agrimonia parviflora'' is a species of perennial herbaceous flowering plant. Small-flowered agrimony, harvestlice agrimony, swamp agrimony, and harvestlice are its most common names in the United States. This plant species is part of the Rosa ...

'' (N) *''

Agrimonia pubescens ''Agrimonia pubescens'', the soft agrimony or downy agrimony, is a flowering plant in the genus ''Agrimonia'', a member of the rose family. It grows in dry areas and woodlands. Taxonomy The species was first described by John Torrey and Asa Gray ...

'' (N) *''

Agrimonia rostellata ''Agrimonia'' (from the Greek ), commonly known as agrimony, is a genus of 12–15 species of perennial herbaceous flowering plants in the family Rosaceae, native to the temperate regions of the Northern Hemisphere, with one species also in Afr ...

'' (N) *''

Agrimonia striata ''Agrimonia striata'' (roadside agrimony, grooved agrimony,Agropyron desertorum ''Agropyron desertorum'' (clustered wheat grass, desert crested wheatgrass, desert wheatgrass, standard crested wheatgrass; syn. ''Agropyron cristatum'' subsp. ''desertorum'' (Fisch. ex Link) A. Löve, ''Agropyron cristatum'' var. ''desertorum'' ...

'' (I) *''

Agrostemma githago ''Agrostemma githago'', the common corn-cockle (also written "corncockle") is a herbaceous annual flowering plant in the pink and carnation family Caryophyllaceae. Description It grows with a stem to long with lanceolate leaves. The flowers ar ...

'' (I) *'' Agrostis avenacea'' (I) *''

Agrostis capillaris ''Agrostis capillaris'', the common bent, colonial bent, or browntop, is a rhizomatous and stoloniferous perennial in the grass family (Poaceae). It is native to Eurasia and has been widely introduced in many parts of the world. Colonial ben ...

'' (I) *'' Agrostis elliottiana'' (N) *''

Agrostis gigantea ''Agrostis gigantea'', known by its common names black bent and redtop, is a perennial grass of the '' Agrostis'' genus. It is native to Europe, but in the cooler areas of North America was widely used as a pasture grass until the 1940s. Althoug ...

'' (I) *''

Agrostis hyemalis ''Agrostis'' (bent or bentgrass) is a large and very nearly Cosmopolitan distribution, cosmopolitan genus of plants in the Poaceae, grass family, found in nearly all the countries in the world. It has been bred as a Genetically modified organis ...

'' (N) *'' Agrostis perennans'' (N) *''

Agrostis scabra ''Agrostis scabra'' is a common species of grass known by the common names hair grass, rough bent, rough bent grass, winter bent grass, and ticklegrass. page 210 A tumbleweed, it is a bunchgrass native to Asia and much of North America, and wid ...

'' (N) *''

Agrostis stolonifera ''Agrostis stolonifera'' (creeping bentgrass, creeping bent, fiorin, spreading bent or carpet bentgrass) is a perennial grass species in the family Poaceae. Description ''Agrostis stolonifera'' is stoloniferous and may form mats or tufts. The ...

'' (I) *''

Ailanthus altissima ''Ailanthus altissima'' , commonly known as tree of heaven, ailanthus, varnish tree, or in Chinese as ''chouchun'' (), is a deciduous tree in the family Simaroubaceae. It is native to northeast and central China, and Taiwan. Unlike other membe ...

'' (I) * ''Aira caryophyllea'' var. ''caryophyllea'' (I) *'' Ajuga genevensis'' (I) *''

Ajuga reptans ''Ajuga reptans'' is commonly known as bugle, blue bugle, bugleherb, bugleweed, carpetweed, carpet bugleweed, and common bugle, and traditionally but less commonly as St. Lawrence plant. It is an herbaceous flowering plant in the mint family Lamia ...

'' (I) *''

Akebia quinata ''Akebia quinata'', commonly known as chocolate vine, five-leaf chocolate vine, or five-leaf akebia, is a shrub that is native to Japan (known as ), China and Korea, commonly used as an ornamental / edible plant in the United States and Europe ...

'' (I) *''

Albizia julibrissin ''Albizia julibrissin'', the Persian silk tree, pink silk tree, or mimosa tree, is a species of tree in the family Fabaceae, native to southwestern Asia and eastern Asia. The genus is named after the Italian nobleman Filippo degli Albizzi, who i ...

'' (I) *''

Alcea rosea ''Alcea rosea'', the common hollyhock, is an ornamental dicot flowering plant in the family Malvaceae. It was imported into Europe from southwestern China during, or possibly before, the 15th century. William Turner, a herbalist of the time, ga ...

'' (I) *'' Aletris farinosa'' (N) *''

Alisma subcordatum ''Alisma subcordatum'', the American water plantain, is a perennial aquatic plant in the water-plantain family (Alismataceae). This plant grows to about 3 feet (1 meter) in height with lance to oval shaped leaves rising from bulbous corms with ...

'' (N) *''

Alisma triviale ''Alisma triviale'', the northern water plantain, is a perennial semi- aquatic or aquatic plant in the water-plantain family (Alismataceae). Description It is a perennial herb that ranges in height from 1-3 ft. Each plant has long-petioled, l ...

'' (N) *''

Alliaria petiolata ''Alliaria petiolata'', or garlic mustard, is a biennial flowering plant in the mustard family (Brassicaceae). It is native to Europe, western and central Asia, north-western Africa, Morocco, Iberia and the British Isles, north to northern Sc ...

'' (I) *''

Allium ampeloprasum ''Allium ampeloprasum'' is a member of the onion genus ''Allium''. The wild plant is commonly known as wild leek or broadleaf wild leek. Its native range is southern Europe to western Asia, but it is cultivated in many other places and has becom ...

'' (I) *'' Allium burdickii'' (N) * ''Allium canadense'' var. ''canadense'' (N) *''

Allium cepa An onion (''Allium cepa'' L., from Latin ''cepa'' meaning "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus ''Allium''. The shallot is a botanical variety of the onion ...

'' (I) * ''Allium cernuum'' var. ''cernuum'' (N) *''

Allium porrum The leek is a vegetable, a cultivar of ''Allium ampeloprasum'', the broadleaf wild leek ( syn. ''Allium porrum''). The edible part of the plant is a bundle of leaf sheaths that is sometimes erroneously called a stem or stalk. The genus ''Alliu ...

'' (I) *''

Allium sativum Garlic (''Allium sativum'') is a species of bulbous flowering plant in the genus ''Allium''. Its close relatives include the onion, shallot, leek, chive, Welsh onion and Chinese onion. It is native to South Asia, Central Asia and northeastern ...

'' (I) *''

Allium schoenoprasum Chives, scientific name ''Allium schoenoprasum'', is a species of flowering plant in the family Amaryllidaceae that produces edible leaves and flowers. Their close relatives include the common onions, garlic, shallot, leek, scallion, and ...

'' (I) * ''Allium schoenoprasum'' var. ''sibiricum'' (N) *''

Allium tricoccum ''Allium tricoccum'' (commonly known as ramp, ramps, ramson, wild leek, wood leek, or wild garlic) is a North American species of wild onion or garlic widespread across eastern Canada and the eastern United States. Many of the common English na ...

'' (N) * ''Allium vineale'' ssp. ''vineale'' (I) *'' Alnus × fallacina'' (N) *''

Alnus glutinosa ''Alnus glutinosa'', the common alder, black alder, European alder, European black alder, or just alder, is a species of tree in the family Betulaceae, native to most of Europe, southwest Asia and northern Africa. It thrives in wet locations whe ...

'' (I) * ''Alnus incana'' ssp. ''rugosa'' (N) *''

Alnus serrulata ''Alnus serrulata'', the hazel alder or smooth alder, is a thicket-forming shrub in the family Betulaceae. It is native to eastern North America and can be found from western Nova Scotia and southern New Brunswick south to Florida and Texas. D ...

'' (N) * ''Alopecurus aequalis'' var. ''aequalis'' (N) *'' Alopecurus carolinianus'' (N) * ''Alopecurus geniculatus'' var. ''geniculatus'' (I) *''

Alopecurus myosuroides ''Alopecurus myosuroides'' is an annual grass, native to Eurasia, found in moist meadows, deciduous forests, and on cultivated and waste land. It is also known as slender meadow foxtail, black-grass, twitch grass, and black twitch. Description ...

'' (I) *''

'' (N) *''

Alopecurus pratensis ''Alopecurus pratensis'', known as the meadow foxtail or the field meadow foxtail, is a Perennial plant, perennial grass belonging to the grass family (Poaceae). It is native to Europe and Asia. This common plant is found on grasslands, especia ...

'' (I) *''

Althaea officinalis ''Althaea officinalis'', the marsh mallow or marshmallow, is a species of flowering plant indigenous to Europe, Western Asia and North Africa, which is used in herbalism and as an ornamental plant. A confection made from the root since ancient ...

'' (I) *'' Alyssum alyssoides'' (I) *'' Amaranthus albus'' (I) *''

Amaranthus blitoides ''Amaranthus blitoides'', commonly called mat amaranth, prostrate pigweed, procumbent pigweed, prostrate amaranth, or matweed, is a Glossary of botanical terms#glabrous, glabrous annual plants species. It usually grows up to 0.6 m, though it may ...

'' (I) * ''Amaranthus blitum'' var. ''emarginatus'' (I) *''

Amaranthus cruentus ''Amaranthus cruentus'' is a flowering plant species that yields the nutritious staple amaranth grain. It is one of three ''Amaranthus'' species cultivated as a grain source, the other two being ''Amaranthus hypochondriacus'' and ''Amaranthus ca ...

'' (I) *''

Amaranthus deflexus ''Amaranthus deflexus'' is also known by the common names low amaranth, Argentina amaranth, perennial pigweed, and large-fruit amaranth. It is native to South America, and has been introduced to many other parts of the world. It is a short-lived ...

'' (I) *''

Amaranthus hybridus ''Amaranthus hybridus'', commonly called green amaranth, slim amaranth, smooth amaranth, smooth pigweed, or red amaranth, is a species of annual flowering plant. It is a weedy species found now over much of North America and introduced into Europ ...

'' (N) *''

Amaranthus palmeri ''Amaranthus palmeri'' is a species of edible flowering plant in the amaranth genus. It has several common names, including carelessweed, dioecious amaranth, Palmer's amaranth, Palmer amaranth, and Palmer's pigweed. It is native to most of the s ...

'' (N) * ''Amaranthus powellii'' ssp. ''powellii'' (N) *''

Amaranthus retroflexus ''Amaranthus retroflexus'' is a species of flowering plant in the family Amaranthaceae with several common names, including red-root amaranth, redroot pigweed, red-rooted pigweed, common amaranth, pigweed amaranth, and common tumbleweed. page 47 ...

'' (N) *''

Amaranthus spinosus ''Amaranthus spinosus'', commonly known as the spiny amaranth, spiny pigweed, prickly amaranth or thorny amaranth, is a plant that is native to the tropical Americas, but is present on most continents as an introduced species and sometimes a nox ...

'' (N) *''

Amaranthus tuberculatus ''Amaranthus tuberculatus'', commonly known as roughfruit amaranth, rough-fruited water-hemp, tall waterhemp, or common waterhemp, is a species of flowering plant. It is a summer annual broadleaf with a germination period that lasts several mont ...

'' (N) * ''Ambrosia artemisiifolia'' var. ''elatior'' (N) * ''Ambrosia artemisiifolia'' var. ''elatior'' (I) *'' Ambrosia bidentata'' (N) *'' Ambrosia × helenae'' (N) * ''Ambrosia trifida'' var. ''trifida'' (N) * ''Amelanchier arborea'' var. ''arborea'' (N) *'' Amelanchier interior'' (N) *''

Amelanchier laevis ''Amelanchier laevis'', the smooth shadbush, smooth serviceberry or Allegheny serviceberry, is a North American species of tree in the rose family Rosaceae, growing up to tall. It is native to eastern Canada and the eastern United States, from ...

'' (N) * ''Amelanchier sanguinea'' var. ''sanguinea'' (N) *'' Amelanchier stolonifera'' (N) *'' Ammannia coccinea'' (N) *'' Ammannia robusta'' (N) *''

Ammophila breviligulata ''Ammophila breviligulata'' (American beachgrass or American marram grass) is a species of grass native to eastern North America, where it grows on sand dunes along the Atlantic Ocean and Great Lakes coasts. Beachgrass thrives under conditions of ...

'' (N) *''

Amorpha fruticosa ''Amorpha fruticosa'' is a species of flowering plant in the legume family Fabaceae, known by several common names, including desert false indigo, false indigo-bush, and bastard indigobush. It is native to North America. Description ''Amorpha f ...

'' (N) *''

Ampelopsis aconitifolia ''Ampelopsis'', commonly known as peppervine or porcelainberry, is a genus of climbing shrubs, in the grape family Vitaceae. The name is derived from the grc, ἅμπελος (''ampelos''), which means "vine". The genus was named in 1803. It is ...

'' (I) *'' Ampelopsis arborea'' (N) * ''Ampelopsis glandulosa'' var. ''brevipedunculata'' (I) *'' Ampelopsis cordata'' (N) *'' Amphiachyris dracunculoides'' (N) * ''Amphicarpaea bracteata'' var. ''bracteata'' (N) * ''Amphicarpaea bracteata'' var. ''comosa'' (N) *'' Amsinckia lycopsoides'' (N) * ''Amsonia tabernaemontana'' var. ''salicifolia'' (N) * ''Anagallis arvensis'' ssp. ''foemina'' (N) * ''Anagallis arvensis'' ssp. ''arvensis'' (I) * ''Anagallis arvensis'' ssp. ''foemina'' (I) *''

Anagallis minima ''Lysimachia minima'' (chaffweed) is a 1-4 inch (2–10 cm) perennial herb in the primula family (Primulaceae). A cosmopolitan species, this small plant is native widely across North America and Eurasia. It can be found growing in moi ...

'' (N) *''

Anaphalis margaritacea ''Anaphalis margaritacea'', commonly known as the western pearly everlasting or pearly everlasting, is an Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or ...

'' (N) *''

Anchusa arvensis ''Anchusa arvensis'' is a plant species of the genus ''Anchusa''. Its common names include small bugloss and annual bugloss. Description This is a hairy annual herb which may reach half a meter in height. It bears small blue tubular flowers, fo ...

'' (I) *''

Anchusa azurea ''Anchusa azurea'' is a species of flowering plant in the family Boraginaceae, known by the common names garden anchusa and Italian bugloss (or just "bugloss"). It is a bristly perennial which may reach 1.5 meters tall and 60 centimeters wide. It ...

'' (I) *''

Anchusa officinalis ''Anchusa officinalis'', commonly known as the common bugloss or alkanet, is a plant species in the genus ''Anchusa''. The plant provides a great deal of nectar for pollinators. It was rated in the top 10 for most nectar production (nectar per u ...

'' (I) * ''Andromeda polifolia'' var. ''glaucophylla'' (N) *'' Andropogon gerardi'' (N) * ''Andropogon glomeratus'' var. ''glomeratus'' (N) * ''Andropogon gyrans'' var. ''gyrans'' (N) * ''Andropogon virginicus'' var. ''virginicus'' (N) *'' Androsace occidentalis'' (N) *''

Anemone blanda ''Anemonoides blanda'', syn. ''Anemone blanda'', the Balkan anemone, Grecian windflower, or winter windflower, is a species of flowering plant in the family Ranunculaceae. The species is native to southeastern Europe and the Middle East. The sp ...

'' (I) *'' Anemone canadensis'' (N) *''

Anemone cylindrica ''Anemone cylindrica'' is an upright growing, clump forming herbaceous species of flowering plant in the buttercup family Ranunculaceae. Plants grow tall, flowering early summer but often found flowering till late summer, the flowers are greenis ...

'' (N) * ''Anemone quinquefolia'' var. ''bifolia'' (N) * ''Anemone quinquefolia'' var. ''quinquefolia'' (N) * ''Anemone virginiana'' var. ''virginiana'' (N) *''

Anethum graveolens Dill (''Anethum graveolens'') is an annual herb in the celery family Apiaceae. It is the only species in the genus ''Anethum''. Dill is grown widely in Eurasia, where its leaves and seeds are used as a herb or spice for flavouring food. Growth ...

'' (I) *''

Angelica atropurpurea ''Angelica atropurpurea'', known commonly as purplestem angelica, great angelica, American angelica, high angelica, and masterwort,Angelica venenosa ''Angelica venenosa'' is a species of plant known as hairy angelica. It is native to the Eastern United States where it ranges from the East Coast to the Ouachita Mountains. It is most often found in open, acidic areas. In the Midwest, its habita ...

'' (N) *''

Anoda cristata ''Anoda cristata'' is a species of flowering plant in the Malvaceae, mallow family known by many common names, including spurred anoda, crested anoda, and violettas. It is native to North and South America. It is known throughout the rest of th ...

'' (N) * ''Antennaria howellii'' ssp. ''canadensis'' (N) * ''Antennaria howellii'' ssp. ''neodioica'' (N) * ''Antennaria howellii'' ssp. ''petaloidea'' (N) *'' Antennaria neglecta'' (N) * ''Antennaria parlinii'' ssp. ''fallax'' (N) * ''Antennaria parlinii'' ssp. ''parlinii'' (N) *''

Antennaria plantaginifolia ''Antennaria plantaginifolia'' (known by the common names plantain leaf pussytoes and woman's tobacco) is a perennial forb native to the eastern North America, that produces cream colored composite flowers in spring. Description ''Antennaria p ...

'' (N) *'' Antennaria solitaria'' (N) *''

Antennaria virginica ''Antennaria virginica '' is a North American species of flowering plants in the family Asteraceae known by the common names shalebarren pussytoes. It grows on Devonian shale in the eastern United States. It is found in central Appalachian Mounta ...

'' (N) *''

Anthemis arvensis ''Anthemis arvensis'', also known as corn chamomile, mayweed, scentless chamomile, or field chamomile is a species of flowering plant in the genus ''Anthemis'', in the aster family. It is used as an ornamental plant. Distribution ;Native :;P ...

'' (I) *''

Anthemis cotula ''Anthemis cotula'', also known as stinking chamomile, or mayweed, is a flowering annual plant with a noticeable and strong odor. The odor is often considered unpleasant, and it is from this that it gains the common epithet "stinking". In pre-co ...

'' (I) *''

Anthemis tinctoria ''Cota tinctoria'', the golden marguerite, yellow chamomile, or oxeye chamomile, is a species of perennial flowering plant in the sunflower family. Other common names include dyer's chamomile, Boston daisy, and Paris daisy. In horticulture this ...

'' (I) *''

Anthoxanthum aristatum ''Anthoxanthum aristatum'' is a species of grass known by the common names awned vernalgrass or annual vernalgrass. It is native to North Africa and southern and western Europe as far north as the Netherlands, and it is known in other regions, in ...

'' (I) * ''Anthoxanthum odoratum'' ssp. ''odoratum'' (I) *''

Anthriscus caucalis ''Anthriscus caucalis'', also burr chervil or bur-chervil, a plant in the family Apiaceae. It is similar in appearance to chervil, the common cooking herb from the same genus. It sends up thin, hollow stems and bears umbel In botany, an umbel i ...

'' (I) *''

Anthriscus sylvestris ''Anthriscus sylvestris'', known as cow parsley, wild chervil, wild beaked parsley, Queen Anne's lace or keck, is a herbaceous biennial or short-lived perennial plant in the family Apiaceae (Umbelliferae), genus ''Anthriscus''. It is also some ...

'' (I) *''

Anthyllis vulneraria ''Anthyllis vulneraria'', the common kidneyvetch, kidney vetch or woundwort is a medicinal plant native to Europe. The name ''vulneraria'' means "wound healer". Description ''Anthyllis vulneraria'' reaches of height. The stem is simple or more ...

'' (I) *''

Antirrhinum majus ''Antirrhinum majus'', the common snapdragon (often - especially in horticulture - simply "snapdragon"), is a species of flowering plant belonging to the genus ''Antirrhinum''. The plant was placed in the family Plantaginaceae following a revis ...

'' (I) *'' Apera interrupta'' (I) *'' Apera spica-venti'' (I) *''

Apios americana ''Apios americana'', sometimes called the American groundnut, potato bean, hopniss, Indian potato, hodoimo, America-hodoimo, cinnamon vine, or groundnut (not to be confused with other plants in the subfamily Faboideae sometimes known by that na ...

'' (N) * ''Apium graveolens'' var. ''dulce'' (N) * ''Apium graveolens'' var. ''dulce'' (I) *'' Aplectrum hyemale'' (N) *''

Apocynum androsaemifolium ''Apocynum androsaemifolium'', the fly-trap dogbane or spreading dogbane, is a flowering plant in the Gentianales order. It is common in North America. Description ''Apocynum androsaemifolium'' is a perennial herb with branching stems, hairs o ...

'' (N) *''

Apocynum cannabinum ''Apocynum cannabinum'' (dogbane, amy root, hemp dogbane, prairie dogbane, Indian hemp, rheumatism root, or wild cotton) is a perennial herbaceous plant that grows throughout much of North America—in the southern half of Canada and throughou ...

'' (N) *''

Apocynum × floribundum ''Apocynum'' × ''floribundum'', the intermediate dogbane, is a member of the family Apocynaceae. It is widespread across Canada, the United States, and northern Mexico.Larson, J., Reif, B., Nelson, B.E. & Hartman, R.L. (2014). Floristic studies ...

'' (N) *''

Aquilegia canadensis ''Aquilegia canadensis'', the Canadian or Canada columbine, eastern red columbine, or wild columbine, is a species of flowering plant in the buttercup family Ranunculaceae. It is an herbaceous perennial native to woodland and rocky slopes in east ...

'' (N) *''

Aquilegia vulgaris ''Aquilegia vulgaris'' is a species of columbine native to Europe with common names that include: European columbine, common columbine, granny's nightcap, and granny's bonnet. It is a flowering herbaceous perennial plant growing to 1.2 m tall ...

'' (I) *''

Arabidopsis thaliana ''Arabidopsis thaliana'', the thale cress, mouse-ear cress or arabidopsis, is a small flowering plant native to Eurasia and Africa. ''A. thaliana'' is considered a weed; it is found along the shoulders of roads and in disturbed land. A winter a ...

'' (I) *'' Arabis canadensis'' (N) *'' Arabis × divaricarpa'' (N) *'' Arabis drummondii'' (N) *''

Arabis glabra ''Arabis glabra'', commonly known as tower rockcress or tower mustard, is a tall, slim, grey-green plant with small creamy flowers at the top of the stem. It usually grows on poor chalky or sandy soils, in open situations. It is native to Europe, ...

'' (N) * ''Arabis hirsuta'' var. ''pycnocarpa'' (N) * ''Arabis laevigata'' var. ''laevigata'' (N) *'' Arabis lyrata'' (N) *'' Arabis missouriensis'' (N) *'' Arabis patens'' (N) *''

Arabis shortii ''Borodinia dentata'', commonly called Short's rockcress, is a species of flowering plant in the mustard family ( Brassicaceae). It is native to the eastern North America, where it is found in Canada and the United States. In the United States, i ...

'' (N) *''

Aralia elata ''Aralia elata'', the Japanese angelica tree, Chinese angelica-tree, or Korean angelica-tree, is a woody plant belonging to the family Araliaceae. It is known as ''tara-no-ki'' (; ) in Japanese, and ''dureup-namu'' () in Korean. Description It i ...

'' (I) *''

Aralia hispida ''Aralia hispida'', commonly known as the bristly sarsaparilla, is a member of the family Araliaceae The Araliaceae are a family of flowering plants composed of about 43 genera and around 1500 species consisting of primarily woody plants and ...

'' (N) *''

Aralia nudicaulis ''Aralia nudicaulis'' (commonly wild sarsaparilla,Dickinson, T.; Metsger, G.; Hull, J.; and Dickinson, R. (2004) The ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 140. false sarsaparilla, shot bush, small spikenard, ...

'' (N) * ''Aralia racemosa'' ssp. ''racemosa'' (N) *''

Aralia spinosa ''Aralia spinosa'', commonly known as devil's walking stick, is a woody species of plant in the genus ''Aralia'', family Araliaceae, native to eastern North America. The various names refer to the viciously sharp, spiny stems, petioles, and even ...

'' (N) *''

Arctium lappa ''Arctium lappa'', commonly called greater burdock, , edible burdock, lappa, beggar's buttons, thorny burr, or happy major is a Eurasian species of plants in the family Asteraceae, cultivated in gardens for its root used as a vegetable. It has b ...

'' (I) *''

Arctium minus ''Arctium minus'', commonly known as lesser burdock, little burdock, louse-bur, common burdock, button-bur, cuckoo-button, or wild rhubarb, is a biennial plant. This plant is native to Europe, but has become introduced elsewhere such as Australi ...

'' (I) *''

Arctostaphylos uva-ursi ''Arctostaphylos uva-ursi'' is a plant species of the genus ''Arctostaphylos'' widely distributed across Circumboreal Region, circumboreal regions of the subarctic Northern Hemisphere. Kinnikinnick (First Nations in Canada, First Nations for "smo ...

'' (N) *'' Arenaria serpyllifolia'' (I) *''

Arethusa bulbosa ''Arethusa bulbosa'', commonly called dragon's mouth orchid, is the only species in the orchid genus ''Arethusa''. The genus is named after a naiad of Greek mythology. This monotypic genus is abbreviated Aret in trade journals. This terrestria ...

'' (N) * ''Argemone albiflora'' ssp. ''albiflora'' (N) *''

Argemone mexicana ''Argemone mexicana'' (Mexican poppy, Mexican prickly poppy, flowering thistle, cardo or cardosanto) is a species of poppy found in Mexico and now widely naturalized in many parts of the world. An extremely hardy pioneer plant, it is tolerant o ...

'' (N) *''

Argentina anserina ''Argentina anserina'' (synonym ''Potentilla anserina'') is a perennial flowering plant in the rose family, Rosaceae. It is known by the common names silverweed, common silverweed or silver cinquefoil. It is native throughout the temperate Northe ...

'' (N) *'' Arisaema dracontium'' (N) * ''Arisaema triphyllum'' ssp. ''pusillum'' (N) * ''Arisaema triphyllum'' ssp. ''stewardsonii'' (N) * ''Arisaema triphyllum'' ssp. ''triphyllum'' (N) * ''Aristida dichotoma'' var. ''dichotoma'' (N) * ''Aristida longespica'' var. ''geniculata'' (N) * ''Aristida longespica'' var. ''longespica'' (N) *'' Aristida oligantha'' (N) * ''Aristida purpurascens'' var. ''purpurascens'' (N) *'' Aristida ramosissima'' (N) *''

Aristolochia clematitis ''Aristolochia clematitis'', the (European) birthwort, is a twining herbaceous plant in the family Aristolochiaceae, which is native to Europe. The leaves are heart shaped and the flowers are pale yellow and tubular in form. The plant seeks ligh ...

'' (I) *''

Aristolochia serpentaria ''Aristolochia serpentaria'' is a species of perennial flowering plant in the Aristolochiaceae (birthwort) family. The species is commonly known as Virginia snakeroot and is native to eastern North America, from Connecticut to southern Michigan ...

'' (N) *'' Aristolochia tomentosa'' (N) *''

Armoracia rusticana Horseradish (''Armoracia rusticana'', syn. ''Cochlearia armoracia'') is a perennial plant of the family Brassicaceae (which also includes mustard, wasabi, broccoli, cabbage, and radish). It is a root vegetable, cultivated and used worldwide as ...

'' (I) *'' Arnoglossum atriplicifolium'' (N) *'' Arnoglossum plantagineum'' (N) *'' Arnoglossum reniforme'' (N) *'' Arnoseris minima'' (I) * ''Arrhenatherum elatius'' var. ''elatius'' (I) *''

Artemisia absinthium ''Artemisia absinthium'' (wormwood, grand wormwood, absinthe, absinthium, absinthe wormwood, mugwort, wermout, wermud, wormit, wormod) is a species of ''Artemisia'', native to temperate regions of Eurasia and North Africa, and widely naturalized ...

'' (I) *''

Artemisia annua ''Artemisia annua'', also known as sweet wormwood, sweet annie, sweet sagewort, annual mugwort or annual wormwood (), is a common type of wormwood native to temperate Asia, but naturalized in many countries including scattered parts of North Am ...

'' (I) *''Artemisia biennis'' (N) *Artemisia biennis, ''Artemisia biennis'' var. ''biennis'' (I) *Artemisia campestris, ''Artemisia campestris'' ssp. ''borealis'' var. ''borealis'' (N) *Artemisia campestris, ''Artemisia campestris'' ssp. ''caudata'' (N) *''Artemisia gmelinii'' (I) *Artemisia ludoviciana, ''Artemisia ludoviciana'' ssp. ''albula'' (N) *Artemisia ludoviciana, ''Artemisia ludoviciana'' ssp. ''ludoviciana'' (N) *''Artemisia pontica'' (I) *''Artemisia stelleriana'' (I) *''Artemisia stelleriana'' (N) *''Artemisia vulgaris'' (N) *Artemisia vulgaris, ''Artemisia vulgaris'' var. ''vulgaris'' (I) *''Arthraxon hispidus'' (I) *''Aruncus dioicus'' (I) *Aruncus dioicus, ''Aruncus dioicus'' var. ''dioicus'' (N) *Arundinaria gigantea, ''Arundinaria gigantea'' ssp. ''gigantea'' (N) *''Asarum canadense'' (N) *''Asclepias amplexicaulis'' (N) *''Asclepias exaltata'' (N) *''Asclepias hirtella'' (N) *Asclepias incarnata, ''Asclepias incarnata'' ssp. ''incarnata'' (N) *''Asclepias purpurascens'' (N) *''Asclepias quadrifolia'' (N) *''Asclepias sullivantii'' (N) *''Asclepias syriaca'' (N) *Asclepias tuberosa, ''Asclepias tuberosa'' ssp. ''interior'' (N) *Asclepias tuberosa, ''Asclepias tuberosa'' ssp. ''tuberosa'' (N) *''Asclepias variegata'' (N) *''Asclepias verticillata'' (N) *''Asclepias viridiflora'' (N) *''Asclepias viridis'' (N) *''Asimina triloba'' (N) *''Asparagus officinalis'' (I) *''Asperugo procumbens'' (I) *''Asplenium bradleyi'' (N) *''Asplenium × clermontiae'' (N) *''Asplenium × ebenoides'' (N) *''Asplenium × gravesii'' (N) *''Asplenium × inexpectatum'' (N) *''Asplenium × kentuckiense'' (N) *''Asplenium montanum'' (N) *''Asplenium pinnatifidum'' (N) *Asplenium platyneuron, ''Asplenium platyneuron'' var. ''platyneuron'' (N) *''Asplenium resiliens'' (N) *''Asplenium rhizophyllum'' (N) *Asplenium ruta-muraria, ''Asplenium ruta-muraria'' var. ''cryptolepis'' (N) *Asplenium ruta-muraria, ''Asplenium ruta-muraria'' var. ''lanceolum'' (N) *Asplenium trichomanes, ''Asplenium trichomanes'' ssp. ''quadrivalens'' (N) *Asplenium trichomanes, ''Asplenium trichomanes'' ssp. ''trichomanes'' (N) *''Asplenium × trudellii'' (N) *''Aster tataricus'' (I) *Astragalus canadensis, ''Astragalus canadensis'' var. ''canadensis'' (N) *''Astragalus neglectus'' (N) *Athyrium filix-femina, ''Athyrium filix-femina'' ssp. ''angustum'' (N) *Athyrium filix-femina, ''Athyrium filix-femina'' ssp. ''asplenioides'' (N) *''Atriplex hortensis'' (I) *''Atriplex patula'' (I) *''Atriplex prostrata'' (N) *''Atriplex rosea'' (I) *Aureolaria flava, ''Aureolaria flava'' var. ''flava'' (N) *Aureolaria flava, ''Aureolaria flava'' var. ''macrantha'' (N) *''Aureolaria levigata'' (N) *Aureolaria pedicularia, ''Aureolaria pedicularia'' var. ''ambigens'' (N) *Aureolaria pedicularia, ''Aureolaria pedicularia'' var. ''pedicularia'' (N) *''Aureolaria virginica'' (N) *''Aurinia saxatilis'' (I) *''Avena fatua'' (I) *''Avena sativa'' (I) *''Azolla caroliniana'' (N)

B

*Ballota nigra, ''Ballota nigra'' var. ''alba'' (I) *Baptisia alba, ''Baptisia alba'' var. ''macrophylla'' (N) *Baptisia australis, ''Baptisia australis'' var. ''australis'' (N) *''Baptisia tinctoria'' (N) *''Barbarea verna'' (I) *''Barbarea vulgaris'' (I) *''Bartonia virginica'' (N) *''Bassia hirsuta'' (I) *''Bassia scoparia'' (I) *''Beckmannia syzigachne'' (N) *''Belamcanda chinensis'' (I) *''Bellis perennis'' (I) *''Berberis × ottawensis'' (N) *''Berberis thunbergii'' (I) *''Berberis vulgaris'' (I) *''Berteroa incana'' (I) *''Besseya bullii'' (N) *Betula alleghaniensis, ''Betula alleghaniensis'' var. ''alleghaniensis'' (N) *Betula alleghaniensis, ''Betula alleghaniensis'' var. ''macrolepis'' (N) *''Betula lenta'' (N) *''Betula nigra'' (N) *Betula papyrifera, ''Betula papyrifera'' var. ''papyrifera'' (N) *''Betula pendula'' (I) *''Betula populifolia'' (N) *''Betula pubescens'' (N) *Betula pubescens, ''Betula pubescens'' ssp. ''pubescens'' (I) *Betula pumila, ''Betula pumila'' var. ''pumila'' (N) *''Betula × purpusii'' (N) *''Bidens aristosa'' (N) *''Bidens beckii'' (N) *''Bidens bipinnata'' (N) *''Bidens cernua'' (N) *''Bidens connata'' (N) *''Bidens coronata'' (N) *''Bidens discoidea'' (N) *''Bidens frondosa'' (N) *''Bidens laevis'' (N) *''Bidens tripartita'' (N) *''Bidens vulgata'' (N) *''Bignonia capreolata'' (N) *''Blephilia ciliata'' (N) *Blephilia hirsuta, ''Blephilia hirsuta'' var. ''hirsuta'' (N) *''Boehmeria cylindrica'' (N) *Boltonia asteroides, ''Boltonia asteroides'' var. ''recognita'' (N) *''Borago officinalis'' (I) *''Botrychium biternatum'' (N) *''Botrychium dissectum'' (N) *Botrychium lanceolatum, ''Botrychium lanceolatum'' var. ''angustisegmentum'' (N) *''Botrychium matricariifolium'' (N) *''Botrychium multifidum'' (N) *''Botrychium oneidense'' (N) *''Botrychium simplex'' (N) *''Botrychium virginianum'' (N) *Bouteloua curtipendula, ''Bouteloua curtipendula'' var. ''curtipendula'' (N) *''Bouteloua gracilis'' (N) *Bouteloua hirsuta, ''Bouteloua hirsuta'' var. ''hirsuta'' (N) *''Brachyelytrum erectum'' (N) *''Brasenia schreberi'' (N) *''Brassica juncea'' (I) *''Brassica napus'' (I) *''Brassica nigra'' (I) *''Brassica oleracea'' (I) *Brassica rapa, ''Brassica rapa'' var. ''amplexicaulis'' (I) *Brassica rapa, ''Brassica rapa'' var. ''rapa'' (I) *Brickellia eupatorioides, ''Brickellia eupatorioides'' var. ''corymbulosa'' (N) *Brickellia eupatorioides, ''Brickellia eupatorioides'' var. ''eupatorioides'' (N) *''Bromus arvensis'' (I) *''Bromus briziformis'' (I) *''Bromus catharticus'' (I) *Bromus ciliatus, ''Bromus ciliatus'' var. ''ciliatus'' (N) *''Bromus erectus'' (I) *Bromus hordeaceus, ''Bromus hordeaceus'' ssp. ''hordeaceus'' (I) *''Bromus inermis'' (N) *Bromus inermis, ''Bromus inermis'' ssp. ''inermis'' var. ''inermis'' (I) *''Bromus kalmii'' (N) *''Bromus latiglumis'' (N) *''Bromus nottowayanus'' (N) *''Bromus pubescens'' (N) *''Bromus racemosus'' (I) *Bromus secalinus, ''Bromus secalinus'' var. ''secalinus'' (I) *''Bromus sterilis'' (I) *''Bromus tectorum'' (I) *''Broussonetia papyrifera'' (I) *''Browallia americana'' (I) *''Brunnera macrophylla'' (I) *''Buchnera americana'' (N) *''Buddleja davidii'' (I) *''Buglossoides arvensis'' (I) *Bulbostylis capillaris, ''Bulbostylis capillaris'' ssp. ''capillaris'' (N) *''Bunias orientalis'' (I) *''Bupleurum lancifolium'' (I) *''Bupleurum rotundifolium'' (I) *''Butomus umbellatus'' (I) *''Buxus sempervirens'' (I)

C

*Cabomba caroliniana, ''Cabomba caroliniana'' var. ''caroliniana'' (N) *Cakile edentula, ''Cakile edentula'' ssp. ''edentula'' var. ''lacustris'' (N) *Cakile edentula, ''Cakile edentula'' ssp. ''edentula'' (N) *Calamagrostis canadensis, ''Calamagrostis canadensis'' var. ''canadensis'' (N) *Calamagrostis canadensis, ''Calamagrostis canadensis'' var. ''macouniana'' (N) *''Calamagrostis coarctata'' (N) *Calamagrostis porteri, ''Calamagrostis porteri'' ssp. ''insperata'' (N) *Calamagrostis stricta, ''Calamagrostis stricta'' ssp. ''inexpansa'' (N) *Calamovilfa longifolia, ''Calamovilfa longifolia'' var. ''magna'' (N) *''Calendula officinalis'' (I) *''Calla palustris'' (N) *Callitriche heterophylla, ''Callitriche heterophylla'' ssp. ''heterophylla'' (N) *''Callitriche palustris'' (N) *''Callitriche terrestris'' (N) *''Calluna vulgaris'' (I) *Calopogon tuberosus, ''Calopogon tuberosus'' var. ''tuberosus'' (N) *Caltha palustris, ''Caltha palustris'' var. ''palustris'' (N) *Calycanthus floridus, ''Calycanthus floridus'' var. ''glaucus'' (N) *''Calystegia hederacea'' (I) *Calystegia sepium, ''Calystegia sepium'' ssp. ''americana'' (N) *Calystegia sepium, ''Calystegia sepium'' ssp. ''angulata'' (N) *Calystegia sepium, ''Calystegia sepium'' ssp. ''sepium'' (I) *''Calystegia silvatica'' (I) *Calystegia silvatica, ''Calystegia silvatica'' ssp. ''fraterniflora'' (N) *Calystegia spithamaea, ''Calystegia spithamaea'' ssp. ''spithamaea'' (N) *''Camassia scilloides'' (N) *''Camelina microcarpa'' (I) *Camelina sativa, ''Camelina sativa'' ssp. ''sativa'' (I) *''Campanula aparinoides'' (N) *''Campanula rapunculoides'' (I) *''Campanula rotundifolia'' (N) *''Campanula trachelium'' (I) *''Campanulastrum americanum'' (N) *''Campsis radicans'' (N) *Cannabis sativa, ''Cannabis sativa'' ssp. ''sativa'' var. ''sativa'' (I) *''Capsella bursa-pastoris'' (I) *''Cardamine angustata'' (N) *''Cardamine bulbifera'' (I) *''Cardamine bulbosa'' (N) *''Cardamine concatenata'' (N) *''Cardamine diphylla'' (N) *''Cardamine dissecta'' (N) *''Cardamine douglassii'' (N) *''Cardamine flexuosa'' (I) *''Cardamine hirsuta'' (I) *''Cardamine impatiens'' (I) *''Cardamine maxima'' (N) *Cardamine parviflora, ''Cardamine parviflora'' var. ''arenicola'' (N) *''Cardamine pensylvanica'' (N) *Cardamine pratensis, ''Cardamine pratensis'' var. ''pratensis'' (N) *''Cardamine rotundifolia'' (N) *''Cardaria draba'' (I) *''Cardiospermum halicacabum'' (I) *''Carduus acanthoides'' (I) *''Carduus crispus'' (I) *''Carduus nutans'' (I) *''Carex aggregata'' (N) *''Carex alata'' (N) *Carex albicans, ''Carex albicans'' var. ''albicans'' (N) *Carex albicans, ''Carex albicans'' var. ''emmonsii'' (N) *''Carex albolutescens'' (N) *''Carex albursina'' (N) *''Carex alopecoidea'' (N) *''Carex amphibola'' (N) *''Carex annectens'' (N) *''Carex appalachica'' (N) *Carex aquatilis, ''Carex aquatilis'' var. ''aquatilis'' (N) *''Carex arctata'' (N) *''Carex argyrantha'' (N) *''Carex atherodes'' (N) *Carex atlantica, ''Carex atlantica'' ssp. ''atlantica'' (N) *Carex atlantica, ''Carex atlantica'' ssp. ''capillacea'' (N) *''Carex aurea'' (N) *''Carex bebbii'' (N) *''Carex bicknellii'' (N) *''Carex blanda'' (N) *''Carex brevior'' (N) *Carex bromoides, ''Carex bromoides'' ssp. ''bromoides'' (N) *Carex brunnescens, ''Carex brunnescens'' ssp. ''sphaerostachya'' (N) *''Carex bushii'' (N) *''Carex buxbaumii'' (N) *Carex canescens, ''Carex canescens'' ssp. ''canescens'' (N) *Carex canescens, ''Carex canescens'' ssp. ''disjuncta'' (N) *''Carex careyana'' (N) *''Carex caroliniana'' (N) *''Carex cephaloidea'' (N) *''Carex cephalophora'' (N) *Carex communis, ''Carex communis'' var. ''communis'' (N) *''Carex comosa'' (N) *''Carex conjuncta'' (N) *''Carex conoidea'' (N) *''Carex crawei'' (N) *Carex crinita, ''Carex crinita'' var. ''brevicrinis'' (N) *Carex crinita, ''Carex crinita'' var. ''crinita'' (N) *''Carex cristatella'' (N) *''Carex crus-corvi'' (N) *''Carex cryptolepis'' (N) *''Carex cumberlandensis'' (N) *''Carex davisii'' (N) *Carex debilis, ''Carex debilis'' var. ''debilis'' (N) *Carex debilis, ''Carex debilis'' var. ''rudgei'' (N) *''Carex decomposita'' (N) *Carex deweyana, ''Carex deweyana'' var. ''deweyana'' (N) *''Carex diandra'' (N) *Carex digitalis, ''Carex digitalis'' var. ''digitalis'' (N) *''Carex disperma'' (N) *''Carex eburnea'' (N) *Carex echinata, ''Carex echinata'' ssp. ''echinata'' (N) *''Carex emoryi'' (N) *''Carex festucacea'' (N) *''Carex flava'' (N) *''Carex folliculata'' (N) *''Carex formosa'' (N) *''Carex frankii'' (N) *''Carex garberi'' (N) *''Carex glaucodea'' (N) *''Carex gracilescens'' (N) *''Carex gracillima'' (N) *''Carex granularis'' (N) *''Carex grayi'' (N) *''Carex grisea'' (N) *''Carex gynandra'' (N) *''Carex haydenii'' (N) *''Carex hirsutella'' (N) *''Carex hirtifolia'' (N) *''Carex hitchcockiana'' (N) *''Carex hyalinolepis'' (N) *''Carex hystericina'' (N) *''Carex interior'' (N) *''Carex intumescens'' (N) *''Carex jamesii'' (N) *''Carex juniperorum'' (N) *''Carex lacustris'' (N) *''Carex laevivaginata'' (N) *Carex lasiocarpa, ''Carex lasiocarpa'' var. ''americana'' (N) *Carex laxiculmis, ''Carex laxiculmis'' var. ''copulata'' (N) *Carex laxiculmis, ''Carex laxiculmis'' var. ''laxiculmis'' (N) *Carex laxiflora, ''Carex laxiflora'' var. ''laxiflora'' (N) *''Carex leavenworthii'' (N) *Carex leptalea, ''Carex leptalea'' ssp. ''leptalea'' (N) *''Carex leptonervia'' (N) *''Carex limosa'' (N) *''Carex longii'' (N) *''Carex louisianica'' (N) *Carex lucorum, ''Carex lucorum'' var. ''lucorum'' (N) *''Carex lupuliformis'' (N) *''Carex lupulina'' (N) *''Carex lurida'' (N) *Carex magellanica, ''Carex magellanica'' ssp. ''irrigua'' (N) *''Carex meadii'' (N) *''Carex merritt-fernaldii'' (N) *''Carex mesochorea'' (N) *''Carex molesta'' (N) *Carex muehlenbergii, ''Carex muehlenbergii'' var. ''enervis'' (N) *Carex muehlenbergii, ''Carex muehlenbergii'' var. ''muehlenbergii'' (N) *''Carex muskingumensis'' (N) *''Carex nigromarginata'' (N) *''Carex normalis'' (N) *''Carex oligocarpa'' (N) *Carex oligosperma, ''Carex oligosperma'' var. ''oligosperma'' (N) *''Carex pallescens'' (N) *''Carex peckii'' (N) *''Carex pedunculata'' (N) *''Carex pellita'' (N) *''Carex pensylvanica'' (N) *''Carex planispicata'' (N) *''Carex plantaginea'' (N) *''Carex platyphylla'' (N) *''Carex praegracilis'' (N) *''Carex prairea'' (N) *''Carex prasina'' (N) *''Carex projecta'' (N) *''Carex pseudocyperus'' (N) *''Carex purpurifera'' (N) *''Carex radiata'' (N) *''Carex retroflexa'' (N) *''Carex retrorsa'' (N) *''Carex richardsonii'' (N) *''Carex rosea'' (N) *Carex sartwellii, ''Carex sartwellii'' var. ''sartwellii'' (N) *''Carex scabrata'' (N) *Carex scoparia, ''Carex scoparia'' var. ''scoparia'' (N) *''Carex seorsa'' (N) *''Carex shortiana'' (N) *''Carex siccata'' (N) *''Carex sparganioides'' (N) *''Carex spicata'' (I) *''Carex sprengelii'' (N) *''Carex squarrosa'' (N) *''Carex sterilis'' (N) *Carex stipata, ''Carex stipata'' var. ''maxima'' (N) *Carex stipata, ''Carex stipata'' var. ''stipata'' (N) *''Carex straminea'' (N) *''Carex striatula'' (N) *''Carex stricta'' (N) *''Carex styloflexa'' (N) *''Carex suberecta'' (N) *''Carex × subimpressa'' (N) *''Carex × sullivantii'' (N) *''Carex swanii'' (N) *''Carex tenera'' (N) *''Carex tenuiflora'' (N) *''Carex tetanica'' (N) *''Carex texensis'' (N) *''Carex timida'' (N) *Carex tonsa, ''Carex tonsa'' var. ''rugosperma'' (N) *''Carex torta'' (N) *Carex tribuloides, ''Carex tribuloides'' var. ''tribuloides'' (N) *''Carex trichocarpa'' (N) *Carex trisperma, ''Carex trisperma'' var. ''trisperma'' (N) *''Carex tuckermanii'' (N) *''Carex typhina'' (N) *''Carex umbellata'' (N) *''Carex utriculata'' (N) *Carex vesicaria, ''Carex vesicaria'' var. ''monile'' (N) *''Carex virescens'' (N) *Carex viridula, ''Carex viridula'' ssp. ''viridula'' (N) *Carex vulpinoidea, ''Carex vulpinoidea'' var. ''vulpinoidea'' (N) *''Carex willdenowii'' (N) *''Carex woodii'' (N) *Carpinus caroliniana, ''Carpinus caroliniana'' ssp. ''virginiana'' (N) *''Carthamus tinctorius'' (I) *''Carum carvi'' (I) *''Carya alba'' (N) *''Carya × brownii'' (N) *''Carya cordiformis'' (N) *''Carya glabra'' (N) *''Carya illinoinensis'' (N) *''Carya laciniosa'' (N) *''Carya ovalis'' (N) *''Carya ovata'' (N) *''Castanea dentata'' (N) *Castanea pumila, ''Castanea pumila'' var. ''pumila'' (N) *''Castilleja coccinea'' (N) *''Catalpa bignonioides'' (N) *''Catalpa ovata'' (I) *''Catalpa speciosa'' (N) *''Caulophyllum giganteum'' (N) *''Caulophyllum thalictroides'' (N) *''Ceanothus americanus'' (N) *''Ceanothus herbaceus'' (N) *''Celastrus orbiculatus'' (I) *''Celastrus scandens'' (N) *''Celosia argentea'' (I) *''Celtis occidentalis'' (N) *''Celtis tenuifolia'' (N) *''Cenchrus longispinus'' (N) *''Centaurea cyanus'' (I) *''Centaurea diffusa'' (I) *''Centaurea jacea'' (I) *''Centaurea nigra'' (I) *''Centaurea nigrescens'' (I) *''Centaurea phrygia'' (I) *''Centaurea scabiosa'' (I) *''Centaurea solstitialis'' (I) *Centaurea stoebe, ''Centaurea stoebe'' ssp. ''micranthos'' (I) *''Centaurea transalpina'' (N) *''Centaurium erythraea'' (I) *''Centaurium pulchellum'' (I) *''Centella erecta'' (N) *''Cephalanthus occidentalis'' (N) *''Cerastium arvense'' (I) *Cerastium arvense, ''Cerastium arvense'' ssp. ''strictum'' (N) *Cerastium arvense, ''Cerastium arvense'' ssp. ''velutinum'' var. ''velutinum'' (N) *Cerastium arvense, ''Cerastium arvense'' ssp. ''velutinum'' (N) *''Cerastium brachypetalum'' (I) *''Cerastium dubium'' (I) *Cerastium fontanum, ''Cerastium fontanum'' ssp. ''vulgare'' (I) *''Cerastium glomeratum'' (I) *Cerastium nutans, ''Cerastium nutans'' var. ''nutans'' (N) *''Cerastium pumilum'' (I) *''Cerastium semidecandrum'' (I) *''Cerastium tomentosum'' (I) *''Ceratocephala testiculata'' (I) *''Ceratophyllum demersum'' (N) *''Ceratophyllum echinatum'' (N) *''Cercidiphyllum japonicum'' (I) *Cercis canadensis, ''Cercis canadensis'' var. ''canadensis'' (N) *''Chaenomeles speciosa'' (I) *''Chaenorhinum minus'' (I) *Chaerophyllum procumbens, ''Chaerophyllum procumbens'' var. ''procumbens'' (N) *Chaerophyllum procumbens, ''Chaerophyllum procumbens'' var. ''shortii'' (N) *Chaerophyllum tainturieri, ''Chaerophyllum tainturieri'' var. ''tainturieri'' (N) *''Chaiturus marrubiastrum'' (I) *Chamaecrista fasciculata, ''Chamaecrista fasciculata'' var. ''fasciculata'' (N) *Chamaecrista nictitans, ''Chamaecrista nictitans'' ssp. ''nictitans'' var. ''nictitans'' (N) *Chamaecrista nictitans, ''Chamaecrista nictitans'' ssp. ''nictitans'' (N) *''Chamaedaphne calyculata'' (N) *''Chamaelirium luteum'' (N) *''Chamaemelum mixtum'' (I) *''Chamaemelum nobile'' (I) *''Chamaesyce humistrata'' (N) *''Chamaesyce maculata'' (N) *''Chamaesyce nutans'' (N) *''Chamaesyce polygonifolia'' (N) *''Chamaesyce prostrata'' (N) *''Chamaesyce serpens'' (N) *''Chamaesyce vermiculata'' (N) *Chamerion angustifolium, ''Chamerion angustifolium'' ssp. ''circumvagum'' (N) *''Chasmanthium latifolium'' (N) *Chelidonium majus, ''Chelidonium majus'' var. ''majus'' (I) *''Chelone glabra'' (N) *Chenopodium album, ''Chenopodium album'' var. ''missouriense'' (N) *Chenopodium album, ''Chenopodium album'' var. ''album'' (I) *Chenopodium ambrosioides, ''Chenopodium ambrosioides'' var. ''ambrosioides'' (I) *Chenopodium berlandieri, ''Chenopodium berlandieri'' var. ''bushianum'' (N) *Chenopodium berlandieri, ''Chenopodium berlandieri'' var. ''zschackii'' (N) *''Chenopodium botrys'' (I) *''Chenopodium capitatum'' (N) *''Chenopodium glaucum'' (I) *''Chenopodium glaucum'' (N) *''Chenopodium humile'' (I) *''Chenopodium humile'' (N) *Chenopodium incanum, ''Chenopodium incanum'' var. ''incanum'' (N) *''Chenopodium murale'' (I) *Chenopodium polyspermum, ''Chenopodium polyspermum'' var. ''acutifolium'' (I) *''Chenopodium pratericola'' (N) *''Chenopodium pumilio'' (I) *''Chenopodium simplex'' (N) *''Chenopodium standleyanum'' (N) *''Chenopodium subglabrum'' (N) *''Chenopodium urbicum'' (I) *''Chenopodium vulvaria'' (I) *''Chimaphila maculata'' (N) *Chimaphila umbellata, ''Chimaphila umbellata'' ssp. ''cisatlantica'' (N) *''Chionanthus virginicus'' (N) *''Chloris verticillata'' (N) *''Chloris virgata'' (N) *''Chorispora tenella'' (I) *''Chrysanthemum × morifolium'' (I) *Chrysogonum virginianum, ''Chrysogonum virginianum'' var. ''virginianum'' (N) *''Chrysopsis mariana'' (N) *''Chrysosplenium americanum'' (N) *''Cichorium intybus'' (I) *''Cicuta bulbifera'' (N) *Cicuta maculata, ''Cicuta maculata'' var. ''maculata'' (N) *''Cinna arundinacea'' (N) *''Cinna latifolia'' (N) *Circaea alpina, ''Circaea alpina'' ssp. ''alpina'' (N) *''Circaea × intermedia'' (N) *Circaea lutetiana, ''Circaea lutetiana'' ssp. ''canadensis'' (N) *''Cirsium altissimum'' (N) *''Cirsium arvense'' (I) *''Cirsium canescens'' (N) *''Cirsium carolinianum'' (N) *''Cirsium discolor'' (N) *''Cirsium muticum'' (N) *''Cirsium pumilum'' (N) *''Cirsium vulgare'' (I) *Citrullus lanatus, ''Citrullus lanatus'' var. ''lanatus'' (I) *''Cladium mariscoides'' (N) *''Cladrastis kentukea'' (N) *''Clarkia pulchella'' (N) *Claytonia caroliniana, ''Claytonia caroliniana'' var. ''caroliniana'' (N) *Claytonia virginica, ''Claytonia virginica'' var. ''virginica'' (N) *Clematis occidentalis, ''Clematis occidentalis'' var. ''occidentalis'' (N) *''Clematis terniflora'' (I) *''Clematis viorna'' (N) *''Clematis virginiana'' (N) *''Cleome hassleriana'' (I) *''Cleome serrulata'' (N) *''Clinopodium arkansanum'' (N) *''Clinopodium vulgare'' (N) *''Clintonia borealis'' (N) *''Clintonia umbellulata'' (N) *''Clitoria mariana'' (N) *''Coix lacryma-jobi'' (I) *''Collinsia verna'' (N) *''Collinsonia canadensis'' (N) *''Collinsonia verticillata'' (N) *''Collomia linearis'' (N) *''Colutea arborescens'' (I) *Comandra umbellata, ''Comandra umbellata'' ssp. ''umbellata'' (N) *''Comarum palustre'' (N) *''Commelina communis'' (I) *Commelina diffusa, ''Commelina diffusa'' var. ''diffusa'' (N) *''Commelina virginica'' (N) *''Comptonia peregrina'' (N) *''Conioselinum chinense'' (N) *''Conium maculatum'' (I) *''Conoclinium coelestinum'' (N) *''Conopholis americana'' (N) *''Conringia orientalis'' (I) *''Consolida ajacis'' (I) *''Consolida regalis'' (I) *''Convallaria majalis'' (I) *''Convolvulus arvensis'' (I) *Conyza canadensis, ''Conyza canadensis'' var. ''canadensis'' (N) *Conyza canadensis, ''Conyza canadensis'' var. ''pusilla'' (N) *''Conyza ramosissima'' (N) *''Coptis trifolia'' (N) *Corallorhiza maculata, ''Corallorhiza maculata'' var. ''maculata'' (N) *Corallorhiza odontorhiza, ''Corallorhiza odontorhiza'' var. ''odontorhiza'' (N) *''Corallorhiza trifida'' (N) *''Corallorhiza wisteriana'' (N) *Coreopsis grandiflora, ''Coreopsis grandiflora'' var. ''harveyana'' (N) *''Coreopsis lanceolata'' (N) *''Coreopsis major'' (N) *Coreopsis tinctoria, ''Coreopsis tinctoria'' var. ''tinctoria'' (N) *''Coreopsis tripteris'' (N) *''Coreopsis verticillata'' (N) *''Coriandrum sativum'' (I) *Corispermum americanum, ''Corispermum americanum'' var. ''americanum'' (N) *''Corispermum pallasii'' (I) *''Corispermum pallasii'' (N) *''Cornus alternifolia'' (N) *''Cornus amomum'' (N) *''Cornus × arnoldiana'' (N) *''Cornus canadensis'' (N) *''Cornus drummondii'' (N) *''Cornus florida'' (N) *''Cornus obliqua'' (N) *''Cornus racemosa'' (N) *''Cornus rugosa'' (N) *Cornus sericea, ''Cornus sericea'' ssp. ''sericea'' (N) *''Coronilla scorpioides'' (I) *''Coronopus didymus'' (I) *''Corydalis aurea'' (N) *''Corydalis flavula'' (N) *''Corydalis sempervirens'' (N) *''Corylus americana'' (N) *Corylus cornuta, ''Corylus cornuta'' var. ''cornuta'' (N) *''Cosmos bipinnatus'' (I) *''Cotinus coggygria'' (I) *''Cotoneaster divaricatus'' (I) *''Cotoneaster simonsii'' (I) *''Crataegus × anomala'' (N) *''Crataegus apiomorpha'' (N) *''Crataegus arborea'' (N) *''Crataegus ater'' (N) *''Crataegus beata'' (N) *''Crataegus brainerdii'' (N) *''Crataegus calpodendron'' (N) *Crataegus chrysocarpa, ''Crataegus chrysocarpa'' var. ''chrysocarpa'' (N) *''Crataegus coleae'' (N) *''Crataegus compacta'' (N) *''Crataegus compta'' (N) *''Crataegus corusca'' (N) *''Crataegus crus-galli'' (N) *''Crataegus disperma'' (N) *''Crataegus dissona'' (N) *''Crataegus engelmannii'' (N) *''Crataegus flabellata'' (N) *''Crataegus holmesiana'' (N) *''Crataegus × hudsonica'' (N) *''Crataegus × immanis'' (N) *''Crataegus indicens'' (N) *''Crataegus intricata'' (N) *''Crataegus iracunda'' (N) *''Crataegus irrasa'' (N) *''Crataegus jesupii'' (N) *''Crataegus lucorum'' (N) *''Crataegus macrosperma'' (N) *''Crataegus margarettiae'' (N) *''Crataegus mollis'' (N) *''Crataegus monogyna'' (I) *''Crataegus nitida'' (N) *''Crataegus pedicellata'' (N) *''Crataegus pennsylvanica'' (N) *''Crataegus persimilis'' (N) *''Crataegus phaenopyrum'' (N) *''Crataegus pringlei'' (N) *''Crataegus prona'' (N) *''Crataegus pruinosa'' (N) *''Crataegus punctata'' (N) *''Crataegus scabrida'' (N) *''Crataegus schuettei'' (N) *''Crataegus submollis'' (N) *''Crataegus suborbiculata'' (N) *''Crataegus succulenta'' (N) *''Crataegus tanuphylla'' (N) *''Crataegus uniflora'' (N) *''Crepis biennis'' (I) *''Crepis capillaris'' (I) *''Crepis nicaeensis'' (I) *''Crepis pulchra'' (I) *''Crepis setosa'' (I) *''Crepis tectorum'' (I) *''Crotalaria sagittalis'' (N) *Croton capitatus, ''Croton capitatus'' var. ''capitatus'' (N) *Croton glandulosus, ''Croton glandulosus'' var. ''septentrionalis'' (N) *''Croton monanthogynus'' (N) *''Cruciata pedemontana'' (I) *''Crypsis schoenoides'' (I) *''Cryptotaenia canadensis'' (N) *''Cucumis melo'' (I) *''Cucumis sativus'' (I) *''Cucurbita foetidissima'' (N) *''Cucurbita maxima'' (I) *''Cucurbita pepo'' (N) *Cucurbita pepo, ''Cucurbita pepo'' var. ''pepo'' (I) *''Cunila origanoides'' (N) *''Cuphea viscosissima'' (N) *''Cuscuta cephalanthi'' (N) *Cuscuta compacta, ''Cuscuta compacta'' var. ''compacta'' (N) *''Cuscuta coryli'' (N) *''Cuscuta epilinum'' (I) *''Cuscuta epithymum'' (I) *''Cuscuta glomerata'' (N) *Cuscuta gronovii, ''Cuscuta gronovii'' var. ''gronovii'' (N) *Cuscuta pentagona, ''Cuscuta pentagona'' var. ''pentagona'' (N) *''Cuscuta polygonorum'' (N) *''Cuscuta suaveolens'' (I) *''Cyclachaena xanthifolia'' (N) *''Cycloloma atriplicifolium'' (N) *''Cydonia oblonga'' (I) *''Cymbalaria muralis'' (I) *''Cynanchum laeve'' (N) *''Cynanchum louiseae'' (I) *''Cynodon dactylon'' (I) *''Cynoglossum officinale'' (I) *Cynoglossum virginianum, ''Cynoglossum virginianum'' var. ''boreale'' (N) *Cynoglossum virginianum, ''Cynoglossum virginianum'' var. ''virginianum'' (N) *''Cynosurus cristatus'' (I) *''Cynosurus echinatus'' (I) *''Cyperus acuminatus'' (N) *''Cyperus amuricus'' (I) *''Cyperus bipartitus'' (N) *''Cyperus compressus'' (N) *''Cyperus diandrus'' (N) *''Cyperus echinatus'' (N) *''Cyperus erythrorhizos'' (N) *''Cyperus esculentus'' (N) *Cyperus esculentus, ''Cyperus esculentus'' var. ''leptostachyus'' (I) *''Cyperus flavescens'' (N) *''Cyperus houghtonii'' (N) *''Cyperus iria'' (I) *''Cyperus lancastriensis'' (N) *Cyperus lupulinus, ''Cyperus lupulinus'' ssp. ''lupulinus'' (N) *Cyperus lupulinus, ''Cyperus lupulinus'' ssp. ''macilentus'' (N) *''Cyperus odoratus'' (N) *''Cyperus refractus'' (N) *''Cyperus retrofractus'' (N) *''Cyperus schweinitzii'' (N) *''Cyperus squarrosus'' (N) *''Cyperus strigosus'' (N) *''Cypripedium acaule'' (N) *Cypripedium × andrewsii, ''Cypripedium × andrewsii'' var. ''andrewsii'' (N) *Cypripedium × andrewsii, ''Cypripedium × andrewsii'' var. ''landonii'' (N) *''Cypripedium candidum'' (N) *Cypripedium parviflorum, ''Cypripedium parviflorum'' var. ''parviflorum'' (N) *Cypripedium parviflorum, ''Cypripedium parviflorum'' var. ''pubescens'' (N) *''Cypripedium reginae'' (N) *''Cyrtomium falcatum'' (I) *''Cystopteris bulbifera'' (N) *''Cystopteris fragilis'' (N) *''Cystopteris × illinoensis'' (N) *''Cystopteris protrusa'' (N) *''Cystopteris tennesseensis'' (N) *''Cystopteris tenuis'' (N) *''Cystopteris × wagneri'' (N) *Cytisus scoparius, ''Cytisus scoparius'' var. ''scoparius'' (I)

D

*Dactylis glomerata, ''Dactylis glomerata'' ssp. ''glomerata'' (I) *''Dactyloctenium aegyptium'' (I) *''Dactylorhiza viridis'' (N) *''Dalea leporina'' (N) *Dalea purpurea, ''Dalea purpurea'' var. ''purpurea'' (N) *''Dalibarda repens'' (N) *''Danthonia compressa'' (N) *''Danthonia spicata'' (N) *''Daphne mezereum'' (I) *Dasiphora fruticosa, ''Dasiphora fruticosa'' ssp. ''floribunda'' (N) *''Dasistoma macrophylla'' (N) *''Datura stramonium'' (I) *''Datura wrightii'' (N) *''Daucus carota'' (I) *''Decodon verticillatus'' (N) *''Delphinium exaltatum'' (N) *''Delphinium tricorne'' (N) *''Dennstaedtia punctilobula'' (N) *''Deparia acrostichoides'' (N) *''Deschampsia cespitosa'' (N) *''Deschampsia danthonioides'' (N) *Deschampsia flexuosa, ''Deschampsia flexuosa'' var. ''flexuosa'' (N) *Descurainia pinnata, ''Descurainia pinnata'' ssp. ''brachycarpa'' (N) *''Descurainia sophia'' (I) *''Desmanthus illinoensis'' (N) *''Desmodium canadense'' (N) *''Desmodium canescens'' (N) *Desmodium ciliare, ''Desmodium ciliare'' var. ''ciliare'' (N) *Desmodium cuspidatum, ''Desmodium cuspidatum'' var. ''cuspidatum'' (N) *Desmodium cuspidatum, ''Desmodium cuspidatum'' var. ''longifolium'' (N) *''Desmodium glutinosum'' (N) *''Desmodium illinoense'' (N) *''Desmodium laevigatum'' (N) *''Desmodium marilandicum'' (N) *''Desmodium nudiflorum'' (N) *''Desmodium obtusum'' (N) *Desmodium paniculatum, ''Desmodium paniculatum'' var. ''paniculatum'' (N) *''Desmodium pauciflorum'' (N) *''Desmodium perplexum'' (N) *''Desmodium rotundifolium'' (N) *''Desmodium sessilifolium'' (N) *''Desmodium viridiflorum'' (N) *''Dianthus armeria'' (I) *''Dianthus barbatus'' (I) *''Dianthus deltoides'' (I) *''Dianthus plumarius'' (I) *''Diarrhena americana'' (N) *''Diarrhena obovata'' (N) *''Dicentra canadensis'' (N) *''Dicentra cucullaria'' (N) *''Dicentra eximia'' (N) *Dichanthelium acuminatum, ''Dichanthelium acuminatum'' var. ''acuminatum'' (N) *Dichanthelium acuminatum, ''Dichanthelium acuminatum'' var. ''fasciculatum'' (N) *Dichanthelium acuminatum, ''Dichanthelium acuminatum'' var. ''lindheimeri'' (N) *''Dichanthelium boreale'' (N) *''Dichanthelium boscii'' (N) *''Dichanthelium clandestinum'' (N) *''Dichanthelium commutatum'' (N) *''Dichanthelium depauperatum'' (N) *Dichanthelium dichotomum, ''Dichanthelium dichotomum'' var. ''dichotomum'' (N) *''Dichanthelium latifolium'' (N) *''Dichanthelium laxiflorum'' (N) *''Dichanthelium leibergii'' (N) *''Dichanthelium linearifolium'' (N) *''Dichanthelium longiligulatum'' (N) *''Dichanthelium meridionale'' (N) *Dichanthelium oligosanthes, ''Dichanthelium oligosanthes'' var. ''oligosanthes'' (N) *Dichanthelium oligosanthes, ''Dichanthelium oligosanthes'' var. ''scribnerianum'' (N) *Dichanthelium ovale, ''Dichanthelium ovale'' var. ''addisonii'' (N) *Dichanthelium sabulorum, ''Dichanthelium sabulorum'' var. ''patulum'' (N) *Dichanthelium sabulorum, ''Dichanthelium sabulorum'' var. ''thinium'' (N) *Dichanthelium sphaerocarpon, ''Dichanthelium sphaerocarpon'' var. ''isophyllum'' (N) *Dichanthelium sphaerocarpon, ''Dichanthelium sphaerocarpon'' var. ''sphaerocarpon'' (N) *''Dichanthelium spretum'' (N) *Dichanthelium villosissimum, ''Dichanthelium villosissimum'' var. ''praecocius'' (N) *''Dichondra carolinensis'' (N) *''Diervilla lonicera'' (N) *''Digitalis grandiflora'' (I) *''Digitalis lanata'' (I) *''Digitalis lutea'' (I) *Digitalis purpurea, ''Digitalis purpurea'' ssp. ''purpurea'' (I) *''Digitaria ciliaris'' (N) *''Digitaria cognata'' (N) *''Digitaria filiformis'' (N) *''Digitaria ischaemum'' (I) *''Digitaria sanguinalis'' (N) *Diodia teres, ''Diodia teres'' var. ''teres'' (N) *Diodia virginiana, ''Diodia virginiana'' var. ''virginiana'' (N) *''Dioscorea polystachya'' (I) *''Dioscorea quaternata'' (N) *''Dioscorea villosa'' (N) *''Diospyros virginiana'' (N) *''Diplazium pycnocarpon'' (N) *''Diplotaxis muralis'' (I) *''Diplotaxis tenuifolia'' (I) *''Dipsacus fullonum'' (I) *''Dipsacus laciniatus'' (I) *''Dipsacus sativus'' (I) *''Dirca palustris'' (N) *''Distichlis spicata'' (N) *Dodecatheon meadia, ''Dodecatheon meadia'' ssp. ''meadia'' (N) *''Doellingeria infirma'' (N) *Doellingeria umbellata, ''Doellingeria umbellata'' var. ''umbellata'' (N) *''Draba brachycarpa'' (N) *Draba cuneifolia, ''Draba cuneifolia'' var. ''cuneifolia'' (N) *''Draba reptans'' (N) *''Draba verna'' (I) *''Dracocephalum parviflorum'' (N) *''Drosera intermedia'' (N) *Drosera rotundifolia, ''Drosera rotundifolia'' var. ''rotundifolia'' (N) *''Dryopteris × benedictii'' (N) *''Dryopteris × boottii'' (N) *''Dryopteris carthusiana'' (N) *''Dryopteris clintoniana'' (N) *''Dryopteris cristata'' (N) *''Dryopteris goldieana'' (N) *''Dryopteris intermedia'' (N) *''Dryopteris marginalis'' (N) *''Dryopteris × mickelii'' (N) *''Dryopteris × neowherryi'' (N) *''Dryopteris × pittsfordensis'' (N) *''Dryopteris × slossoniae'' (N) *''Dryopteris × triploidea'' (N) *''Dryopteris × uliginosa'' (N) *''Duchesnea indica'' (I) *Dulichium arundinaceum, ''Dulichium arundinaceum'' var. ''arundinaceum'' (N) *''Dyssodia papposa'' (N)

E

*''Echinacea purpurea'' (N) *''Echinochloa crus-galli'' (I) *''Echinochloa frumentacea'' (I) *Echinochloa muricata, ''Echinochloa muricata'' var. ''microstachya'' (N) *Echinochloa muricata, ''Echinochloa muricata'' var. ''muricata'' (N) *''Echinochloa walteri'' (N) *''Echinocystis lobata'' (N) *''Echinodorus berteroi'' (N) *''Echium vulgare'' (I) *''Eclipta prostrata'' (N) *''Egeria densa'' (I) *''Elaeagnus angustifolia'' (I) *''Elaeagnus multiflora'' (I) *Elaeagnus umbellata, ''Elaeagnus umbellata'' var. ''parvifolia'' (I) *''Elatine brachysperma'' (N) *Eleocharis acicularis, ''Eleocharis acicularis'' var. ''acicularis'' (N) *Eleocharis compressa, ''Eleocharis compressa'' var. ''compressa'' (N) *''Eleocharis elliptica'' (N) *''Eleocharis engelmannii'' (N) *''Eleocharis erythropoda'' (N) *''Eleocharis geniculata'' (N) *''Eleocharis intermedia'' (N) *''Eleocharis obtusa'' (N) *Eleocharis olivacea, ''Eleocharis olivacea'' var. ''olivacea'' (N) *''Eleocharis ovata'' (N) *Eleocharis palustris, ''Eleocharis palustris'' var. ''palustris'' (N) *''Eleocharis parvula'' (N) *''Eleocharis quadrangulata'' (N) *''Eleocharis quinqueflora'' (N) *''Eleocharis rostellata'' (N) *Eleocharis tenuis, ''Eleocharis tenuis'' var. ''tenuis'' (N) *Eleocharis tenuis, ''Eleocharis tenuis'' var. ''verrucosa'' (N) *''Eleocharis wolfii'' (N) *''Elephantopus Elephantopus carolinianus, carolinianus'' (N) *''Eleusine indica'' (I) *''Ellisia nyctelea'' (N) *''Elodea canadensis'' (N) *''Elodea nuttallii'' (N) *''Elymus canadensis'' (N) *Elymus hystrix, ''Elymus hystrix'' var. ''bigeloviana'' (N) *Elymus hystrix, ''Elymus hystrix'' var. ''hystrix'' (N) *''Elymus repens'' (I) *''Elymus riparius'' (N) *''Elymus submuticus'' (N) *Elymus trachycaulus, ''Elymus trachycaulus'' ssp. ''subsecundus'' (N) *Elymus trachycaulus, ''Elymus trachycaulus'' ssp. ''trachycaulus'' (N) *''Elymus villosus'' (N) *Elymus virginicus, ''Elymus virginicus'' var. ''virginicus'' (N) *''Enemion biternatum'' (N) *''Epifagus virginiana'' (N) *''Epigaea repens'' (N) *Epilobium ciliatum, ''Epilobium ciliatum'' ssp. ''ciliatum'' (N) *Epilobium ciliatum, ''Epilobium ciliatum'' ssp. ''glandulosum'' (N) *''Epilobium coloratum'' (N) *''Epilobium hirsutum'' (I) *''Epilobium leptophyllum'' (N) *''Epilobium parviflorum'' (I) *''Epilobium strictum'' (N) *''Epilobium × wisconsinense'' (N) *''Epipactis helleborine'' (I) *''Equisetum arvense'' (N) *''Equisetum × ferrissii'' (N) *''Equisetum fluviatile'' (N) *Equisetum hyemale, ''Equisetum hyemale'' var. ''affine'' (N) *''Equisetum laevigatum'' (N) *''Equisetum × mackaii'' (N) *''Equisetum × nelsonii'' (N) *''Equisetum sylvaticum'' (N) *Equisetum variegatum, ''Equisetum variegatum'' var. ''variegatum'' (N) *''Eragrostis capillaris'' (N) *''Eragrostis cilianensis'' (I) *''Eragrostis curvula'' (I) *''Eragrostis frankii'' (N) *''Eragrostis hirsuta'' (N) *''Eragrostis hypnoides'' (N) *''Eragrostis minor'' (I) *Eragrostis pectinacea, ''Eragrostis pectinacea'' var. ''miserrima'' (N) *Eragrostis pectinacea, ''Eragrostis pectinacea'' var. ''pectinacea'' (N) *''Eragrostis pilosa'' (N) *''Eragrostis spectabilis'' (N) *''Eragrostis trichodes'' (N) *''Eranthis hyemalis'' (I) *Erechtites hieraciifolia, ''Erechtites hieraciifolia'' var. ''hieraciifolia'' (N) *''Erica tetralix'' (I) *''Erigenia bulbosa'' (N) *''Erigeron annuus'' (N) *Erigeron philadelphicus, ''Erigeron philadelphicus'' var. ''philadelphicus'' (N) *Erigeron pulchellus, ''Erigeron pulchellus'' var. ''brauniae'' (N) *Erigeron pulchellus, ''Erigeron pulchellus'' var. ''pulchellus'' (N) *Erigeron strigosus, ''Erigeron strigosus'' var. ''strigosus'' (N) *''Eriocaulon aquaticum'' (N) *''Eriochloa contracta'' (N) *Eriophorum gracile, ''Eriophorum gracile'' var. ''gracile'' (N) *''Eriophorum virginicum'' (N) *''Eriophorum viridicarinatum'' (N) *Erodium cicutarium, ''Erodium cicutarium'' ssp. ''cicutarium'' (I) *''Erucastrum gallicum'' (I) *Eryngium yuccifolium, ''Eryngium yuccifolium'' var. ''yuccifolium'' (N) *Erysimum capitatum, ''Erysimum capitatum'' var. ''capitatum'' (N) *''Erysimum cheiranthoides'' (I) *Erysimum inconspicuum, ''Erysimum inconspicuum'' var. ''inconspicuum'' (N) *''Erysimum repandum'' (I) *''Erythronium albidum'' (N) *Erythronium americanum, ''Erythronium americanum'' ssp. ''americanum'' (N) *''Erythronium rostratum'' (N) *Eschscholzia californica, ''Eschscholzia californica'' ssp. ''californica'' (N) *''Eubotrys recurva'' (N) *Euonymus alatus, ''Euonymus alatus'' var. ''alatus'' (I) *''Euonymus americanus'' (N) *Euonymus atropurpureus, ''Euonymus atropurpureus'' var. ''atropurpureus'' (N) *''Euonymus europaeus'' (I) *Euonymus fortunei, ''Euonymus fortunei'' var. ''radicans'' (I) *''Euonymus obovatus'' (N) *''Eupatoriadelphus fistulosus'' (N) *Eupatoriadelphus maculatus, ''Eupatoriadelphus maculatus'' var. ''maculatus'' (N) *Eupatorium album, ''Eupatorium album'' var. ''album'' (N) *''Eupatorium altissimum'' (N) *''Eupatorium godfreyanum'' (N) (a hybrid of ''Eupatorium rotundifolium'' and ''Eupatorium sessilifolium'') *Eupatorium hyssopifolium, ''Eupatorium hyssopifolium'' var. ''laciniatum'' (N) *Eupatorium perfoliatum, ''Eupatorium perfoliatum'' var. ''perfoliatum'' (N) *Eupatorium purpureum, ''Eupatorium purpureum'' var. ''purpureum'' (N) *Eupatorium rotundifolium, ''Eupatorium rotundifolium'' var. ''ovatum'' (N) *Eupatorium rotundifolium, ''Eupatorium rotundifolium'' var. ''rotundifolium'' (N) *''Eupatorium serotinum'' (N) *Eupatorium sessilifolium, ''Eupatorium sessilifolium'' var. ''sessilifolium'' (N) *''Euphorbia commutata'' (N) *''Euphorbia corollata'' (N) *''Euphorbia cyathophora'' (N) *''Euphorbia cyparissias'' (I) *''Euphorbia davidii'' (I) *''Euphorbia dentata'' (I) *Euphorbia dentata, ''Euphorbia dentata'' var. ''dentata'' (N) *Euphorbia esula, ''Euphorbia esula'' var. ''esula'' (I) *''Euphorbia falcata'' (I) *''Euphorbia helioscopia'' (I) *''Euphorbia lathyris'' (I) *''Euphorbia marginata'' (N) *''Euphorbia peplus'' (I) *''Euphorbia platyphyllos'' (I) *''Euphorbia purpurea'' (N) *''Euphorbia spathulata'' (N) *''Eurybia divaricata'' (N) *''Eurybia macrophylla'' (N) *''Eurybia schreberi'' (N) *''Eurybia surculosa'' (N) *Euthamia graminifolia, ''Euthamia graminifolia'' var. ''graminifolia'' (N) *''Euthamia gymnospermoides'' (N)

F

*''Fagopyrum esculentum'' (I) *''Fagus grandifolia'' (N) *''Fagus sylvatica'' (I) *''Fatoua villosa'' (I) *''Festuca brevipila'' (I) *''Festuca filiformis'' (I) *''Festuca rubra'' (I) *Festuca rubra, ''Festuca rubra'' ssp. ''rubra'' (N) *''Festuca subverticillata'' (N) *''Filago vulgaris'' (I) *''Filipendula rubra'' (N) *Filipendula ulmaria, ''Filipendula ulmaria'' ssp. ''ulmaria'' (I) *''Fimbristylis autumnalis'' (N) *''Fleischmannia incarnata'' (N) *''Floerkea proserpinacoides'' (N) *''Foeniculum vulgare'' (I) *Fontanesia phillyreoides, ''Fontanesia phillyreoides'' ssp. ''fortunei'' (I) *''Forsythia × intermedia'' (I) *''Forsythia suspensa'' (I) *Fragaria vesca, ''Fragaria vesca'' ssp. ''americana'' (N) *Fragaria vesca, ''Fragaria vesca'' ssp. ''vesca'' (N) *Fragaria virginiana, ''Fragaria virginiana'' ssp. ''grayana'' (N) *Fragaria virginiana, ''Fragaria virginiana'' ssp. ''virginiana'' (N) *''Frangula alnus'' (I) *''Frangula alnus'' (N) *''Frangula caroliniana'' (N) *''Frasera caroliniensis'' (N) *''Fraxinus americana'' (N) *''Fraxinus excelsior'' (I) *''Fraxinus nigra'' (N) *''Fraxinus pennsylvanica'' (N) *''Fraxinus profunda'' (N) *''Fraxinus quadrangulata'' (N) *Froelichia floridana, ''Froelichia floridana'' var. ''campestris'' (N) *''Froelichia gracilis'' (N) *Fumaria officinalis, ''Fumaria officinalis'' ssp. ''officinalis'' (I)

G

*Gaillardia pulchella, ''Gaillardia pulchella'' var. ''pulchella'' (N) *''Galactia volubilis'' (N) *''Galanthus elwesii'' (I) *''Galanthus nivalis'' (I) *''Galax urceolata'' (N) *''Galearis spectabilis'' (N) *''Galeopsis bifida'' (I) *Galeopsis ladanum, ''Galeopsis ladanum'' var. ''ladanum'' (I) *Galeopsis tetrahit, ''Galeopsis tetrahit'' var. ''tetrahit'' (I) *''Galinsoga parviflora'' (I) *''Galinsoga quadriradiata'' (I) *''Galium aparine'' (N) *''Galium asprellum'' (N) *''Galium boreale'' (N) *Galium circaezans, ''Galium circaezans'' var. ''hypomalacum'' (N) *''Galium concinnum'' (N) *''Galium labradoricum'' (N) *''Galium lanceolatum'' (N) *''Galium mollugo'' (I) *Galium obtusum, ''Galium obtusum'' ssp. ''obtusum'' (N) *''Galium odoratum'' (I) *''Galium palustre'' (N) *Galium pilosum, ''Galium pilosum'' var. ''pilosum'' (N) *''Galium tinctorium'' (N) *Galium trifidum, ''Galium trifidum'' ssp. ''trifidum'' (N) *''Galium triflorum'' (N) *Galium verum, ''Galium verum'' var. ''verum'' (I) *''Gamochaeta purpurea'' (N) *''Gaultheria hispidula'' (N) *''Gaultheria procumbens'' (N) *''Gaura biennis'' (N) *''Gaura longiflora'' (N) *''Gaura mollis'' (N) *''Gaylussacia baccata'' (N) *''Genista tinctoria'' (I) *''Gentiana alba'' (N) *Gentiana andrewsii, ''Gentiana andrewsii'' var. ''andrewsii'' (N) *''Gentiana × billingtonii'' (N) *''Gentiana clausa'' (N) *''Gentiana puberulenta'' (N) *Gentiana saponaria, ''Gentiana saponaria'' var. ''saponaria'' (N) *''Gentiana villosa'' (N) *Gentianella quinquefolia, ''Gentianella quinquefolia'' ssp. ''occidentalis'' (N) *''Gentianopsis crinita'' (N) *Gentianopsis virgata, ''Gentianopsis virgata'' ssp. ''victorinii'' (N) *Gentianopsis virgata, ''Gentianopsis virgata'' ssp. ''virgata'' (N) *''Geranium bicknellii'' (N) *Geranium carolinianum, ''Geranium carolinianum'' var. ''carolinianum'' (N) *''Geranium columbinum'' (I) *''Geranium dissectum'' (I) *''Geranium maculatum'' (N) *''Geranium molle'' (I) *''Geranium pusillum'' (I) *''Geranium robertianum'' (I) *Geranium robertianum, ''Geranium robertianum'' ssp. ''robertianum'' (N) *''Geranium sanguineum'' (I) *''Geum aleppicum'' (N) *Geum canadense, ''Geum canadense'' var. ''canadense'' (N) *Geum laciniatum, ''Geum laciniatum'' var. ''laciniatum'' (N) *''Geum rivale'' (N) *''Geum urbanum'' (I) *''Geum vernum'' (N) *''Geum virginianum'' (N) *Gilia capitata, ''Gilia capitata'' ssp. ''capitata'' (N) *''Gillenia stipulata'' (N) *''Gillenia trifoliata'' (N) *''Gladiolus × gandavensis'' (I) *''Glandularia canadensis'' (N) *''Glandularia × hybrida'' (I) *''Glebionis segetum'' (I) *''Glechoma hederacea'' (I) *''Gleditsia triacanthos'' (N) *''Glyceria acutiflora'' (N) *''Glyceria borealis'' (N) *''Glyceria canadensis'' (N) *Glyceria grandis, ''Glyceria grandis'' var. ''grandis'' (N) *''Glyceria melicaria'' (N) *''Glyceria septentrionalis'' (N) *''Glyceria striata'' (N) *''Glycine max'' (I) *''Gnaphalium uliginosum'' (I) *''Gomphrena globosa'' (I) *''Goodyera pubescens'' (N) *''Goodyera repens'' (N) *''Goodyera tesselata'' (N) *''Gratiola neglecta'' (N) *Gratiola virginiana, ''Gratiola virginiana'' var. ''virginiana'' (N) *''Gratiola viscidula'' (N) *Grindelia lanceolata, ''Grindelia lanceolata'' var. ''lanceolata'' (N) *Grindelia squarrosa, ''Grindelia squarrosa'' var. ''serrulata'' (N) *Grindelia squarrosa, ''Grindelia squarrosa'' var. ''squarrosa'' (N) *''Guizotia abyssinica'' (I) *Gutierrezia texana, ''Gutierrezia texana'' var. ''texana'' (N) *''Gymnocarpium appalachianum'' (N) *''Gymnocarpium × brittonianum'' (N) *''Gymnocarpium dryopteris'' (N) *''Gymnocladus dioicus'' (N) *''Gymnopogon ambiguus'' (N) *''Gypsophila paniculata'' (I) *''Gypsophila scorzonerifolia'' (I)

H

*Hackelia deflexa, ''Hackelia deflexa'' var. ''americana'' (N) *''Hackelia virginiana'' (N) *Halesia tetraptera, ''Halesia tetraptera'' var. ''tetraptera'' (N) *''Hamamelis virginiana'' (N) *''Hasteola suaveolens'' (N) *''Hedeoma hispida'' (N) *''Hedeoma pulegioides'' (N) *''Hedera helix'' (I) *Helenium amarum, ''Helenium amarum'' var. ''amarum'' (N) *Helenium autumnale, ''Helenium autumnale'' var. ''autumnale'' (N) *''Helenium flexuosum'' (N) *''Helianthemum bicknellii'' (N) *''Helianthemum canadense'' (N) *''Helianthus × ambiguus'' (N) *''Helianthus angustifolius'' (N) *''Helianthus annuus'' (N) *''Helianthus × brevifolius'' (N) *''Helianthus × cinereus'' (N) *''Helianthus decapetalus'' (N) *''Helianthus divaricatus'' (N) *''Helianthus × divariserratus'' (N) *''Helianthus × doronicoides'' (N) *''Helianthus giganteus'' (N) *''Helianthus × glaucus'' (N) *''Helianthus grosseserratus'' (N) *''Helianthus hirsutus'' (N) *''Helianthus × intermedius'' (N) *''Helianthus × kellermanii'' (N) *''Helianthus × laetiflorus'' (N) *''Helianthus × luxurians'' (N) *''Helianthus maximiliani'' (N) *''Helianthus microcephalus'' (N) *''Helianthus mollis'' (N) *''Helianthus × multiflorus'' (N) *Helianthus occidentalis, ''Helianthus occidentalis'' ssp. ''occidentalis'' (N) *Helianthus petiolaris, ''Helianthus petiolaris'' ssp. ''petiolaris'' (N) *''Helianthus salicifolius'' (N) *''Helianthus strumosus'' (N) *''Helianthus tuberosus'' (N) *Heliopsis helianthoides, ''Heliopsis helianthoides'' var. ''helianthoides'' (N) *Heliopsis helianthoides, ''Heliopsis helianthoides'' var. ''occidentalis'' (N) *''Heliotropium europaeum'' (I) *''Heliotropium indicum'' (I) *''Helleborus viridis'' (I) *''Hemerocallis fulva'' (I) *''Hemerocallis lilioasphodelus'' (I) *Hepatica nobilis, ''Hepatica nobilis'' var. ''acuta'' (N) *Hepatica nobilis, ''Hepatica nobilis'' var. ''obtusa'' (N) *''Heracleum maximum'' (N) *''Hesperis matronalis'' (I) *''Hesperostipa spartea'' (N) *''Heteranthera dubia'' (N) *''Heteranthera reniformis'' (N) *Heterotheca camporum, ''Heterotheca camporum'' var. ''camporum'' (N) *Heuchera americana, ''Heuchera americana'' var. ''americana'' (N) *Heuchera americana, ''Heuchera americana'' var. ''hirsuticaulis'' (N) *Heuchera americana, ''Heuchera americana'' var. ''hispida'' (N) *''Heuchera longiflora'' (N) *Heuchera parviflora, ''Heuchera parviflora'' var. ''parviflora'' (N) *Heuchera villosa, ''Heuchera villosa'' var. ''villosa'' (N) *Hexalectris spicata, ''Hexalectris spicata'' var. ''spicata'' (N) *''Hibiscus laevis'' (N) *''Hibiscus moscheutos'' (N) *''Hibiscus syriacus'' (I) *''Hibiscus trionum'' (I) *''Hieracium aurantiacum'' (I) *''Hieracium caespitosum'' (I) *Hieracium × flagellare, ''Hieracium × flagellare'' var. ''flagellare'' (I) *''Hieracium × floribundum'' (I) *''Hieracium greenii'' (N) *''Hieracium gronovii'' (N) *Hieracium kalmii, ''Hieracium kalmii'' var. ''fasciculatum'' (N) *Hieracium kalmii, ''Hieracium kalmii'' var. ''kalmii'' (N) *''Hieracium longipilum'' (N) *''Hieracium paniculatum'' (N) *Hieracium pilosella, ''Hieracium pilosella'' var. ''pilosella'' (I) *''Hieracium piloselloides'' (I) *Hieracium scabrum, ''Hieracium scabrum'' var. ''scabrum'' (N) *''Hieracium venosum'' (N) *Hierochloe hirta, ''Hierochloe hirta'' ssp. ''arctica'' (N) *''Holcus lanatus'' (I) *''Holosteum umbellatum'' (I) *Hordeum brachyantherum, ''Hordeum brachyantherum'' ssp. ''brachyantherum'' (N) *Hordeum jubatum, ''Hordeum jubatum'' ssp. ''jubatum'' (N) *Hordeum marinum, ''Hordeum marinum'' ssp. ''gussonianum'' (I) *''Hordeum pusillum'' (N) *''Hordeum vulgare'' (I) *''Hosta lancifolia'' (I) *''Hosta ventricosa'' (I) *''Hottonia inflata'' (N) *''Houstonia caerulea'' (N) *''Houstonia canadensis'' (N) *''Houstonia longifolia'' (N) *Houstonia purpurea, ''Houstonia purpurea'' var. ''calycosa'' (N) *Houstonia purpurea, ''Houstonia purpurea'' var. ''purpurea'' (N) *Hudsonia tomentosa, ''Hudsonia tomentosa'' var. ''tomentosa'' (N) *''Humulus japonicus'' (I) *Humulus lupulus, ''Humulus lupulus'' var. ''lupuloides'' (N) *Humulus lupulus, ''Humulus lupulus'' var. ''pubescens'' (N) *Humulus lupulus, ''Humulus lupulus'' var. ''lupulus'' (I) *''Huperzia × bartleyi'' (N) *''Huperzia × buttersii'' (N) *''Huperzia lucidula'' (N) *''Huperzia porophila'' (N) *''Hyacinthoides non-scripta'' (I) *''Hybanthus concolor'' (N) *''Hydrangea arborescens'' (N) *''Hydrastis canadensis'' (N) *''Hydrocotyle americana'' (N) *''Hydrocotyle ranunculoides'' (N) *''Hydrocotyle sibthorpioides'' (I) *''Hydrocotyle umbellata'' (N) *''Hydrophyllum appendiculatum'' (N) *''Hydrophyllum canadense'' (N) *''Hydrophyllum macrophyllum'' (N) *Hydrophyllum virginianum, ''Hydrophyllum virginianum'' var. ''virginianum'' (N) *''Hylotelephium telephioides'' (N) *Hylotelephium telephium, ''Hylotelephium telephium'' ssp. ''telephium'' (I) *''Hypericum ascyron'' (N) *''Hypericum boreale'' (N) *''Hypericum canadense'' (N) *''Hypericum drummondii'' (N) *''Hypericum ellipticum'' (N) *''Hypericum gentianoides'' (N) *''Hypericum gymnanthum'' (N) *Hypericum hypericoides, ''Hypericum hypericoides'' ssp. ''multicaule'' (N) *''Hypericum kalmianum'' (N) *''Hypericum majus'' (N) *''Hypericum mutilum'' (N) *''Hypericum perforatum'' (I) *''Hypericum prolificum'' (N) *''Hypericum punctatum'' (N) *''Hypericum sphaerocarpum'' (N) *''Hypericum virgatum'' (N) *''Hypochaeris glabra'' (I) *''Hypochaeris radicata'' (I) *''Hypoxis hirsuta'' (N)

I

*''Iberis umbellata'' (I) *''Ilex crenata'' (I) *''Ilex mucronata'' (N) *Ilex opaca, ''Ilex opaca'' var. ''opaca'' (N) *''Ilex verticillata'' (N) *''Impatiens balsamina'' (I) *''Impatiens capensis'' (N) *''Impatiens pallida'' (N) *''Inula helenium'' (I) *''Iodanthus pinnatifidus'' (N) *''Ionactis linariifolius'' (N) *''Ipomoea coccinea'' (I) *''Ipomoea hederacea'' (I) *''Ipomoea lacunosa'' (N) *''Ipomoea pandurata'' (N) *''Ipomoea purpurea'' (I) *''Ipomopsis rubra'' (N) *''Iris brevicaulis'' (N) *''Iris cristata'' (N) *''Iris fulva'' (N) *''Iris germanica'' (I) *''Iris pseudacorus'' (I) *Iris verna, ''Iris verna'' var. ''smalliana'' (N) *''Iris versicolor'' (N) *Iris virginica, ''Iris virginica'' var. ''shrevei'' (N) *''Isoetes appalachiana'' (N) *''Isoetes engelmannii'' (N) *''Isoetes tenella'' (N) *''Isotria medeoloides'' (N) *''Isotria verticillata'' (N) *Iva annua, ''Iva annua'' var. ''annua'' (N)

J

*''Jacquemontia tamnifolia'' (N) *''Jeffersonia diphylla'' (N) *''Juglans cinerea'' (N) *''Juglans nigra'' (N) *''Juncus acuminatus'' (N) *Juncus alpinoarticulatus, ''Juncus alpinoarticulatus'' ssp. ''nodulosus'' (N) *''Juncus anthelatus'' (N) *Juncus arcticus, ''Juncus arcticus'' ssp. ''littoralis'' (N) *''Juncus articulatus'' (N) *''Juncus biflorus'' (N) *''Juncus brachycarpus'' (N) *''Juncus brachycephalus'' (N) *Juncus bufonius, ''Juncus bufonius'' var. ''bufonius'' (N) *''Juncus canadensis'' (N) *''Juncus compressus'' (I) *''Juncus dichotomus'' (N) *''Juncus diffusissimus'' (N) *''Juncus dudleyi'' (N) *Juncus effusus, ''Juncus effusus'' var. ''decipiens'' (N) *Juncus effusus, ''Juncus effusus'' var. ''pylaei'' (N) *Juncus effusus, ''Juncus effusus'' var. ''solutus'' (N) *Juncus gerardii, ''Juncus gerardii'' var. ''gerardii'' (N) *''Juncus greenei'' (N) *Juncus interior, ''Juncus interior'' var. ''interior'' (N) *''Juncus marginatus'' (N) *Juncus nodosus, ''Juncus nodosus'' var. ''nodosus'' (N) *''Juncus secundus'' (N) *''Juncus × stuckeyi'' (N) *Juncus subcaudatus, ''Juncus subcaudatus'' var. ''subcaudatus'' (N) *''Juncus tenuis'' (N) *''Juncus torreyi'' (N) *Juniperus communis, ''Juniperus communis'' var. ''depressa'' (N) *Juniperus virginiana, ''Juniperus virginiana'' var. ''virginiana'' (N) *''Justicia americana'' (N)

K

*''Kalmia latifolia'' (N) *''Kerria japonica'' (I) *''Kickxia elatine'' (I) *''Kickxia spuria'' (I) *''Koeleria macrantha'' (N) *''Koelreuteria paniculata'' (I) *Krigia biflora, ''Krigia biflora'' var. ''biflora'' (N) *''Krigia dandelion'' (N) *''Krigia virginica'' (N) *''Kummerowia stipulacea'' (I) *''Kummerowia striata'' (I) *''Kyllinga pumila'' (N)

L

*''Lablab purpureus'' (I) *''Lactuca biennis'' (N) *''Lactuca canadensis'' (N) *Lactuca floridana, ''Lactuca floridana'' var. ''floridana'' (N) *Lactuca floridana, ''Lactuca floridana'' var. ''villosa'' (N) *Lactuca hirsuta, ''Lactuca hirsuta'' var. ''sanguinea'' (N) *''Lactuca × morssii'' (N) *''Lactuca saligna'' (I) *''Lactuca sativa'' (I) *''Lactuca serriola'' (I) *Lactuca tatarica, ''Lactuca tatarica'' var. ''pulchella'' (N) *''Lamium album'' (I) *''Lamium amplexicaule'' (I) *''Lamium maculatum'' (I) *Lamium purpureum, ''Lamium purpureum'' var. ''purpureum'' (I) *''Laportea canadensis'' (N) *''Lappula squarrosa'' (I) *''Lapsana communis'' (I) *''Larix laricina'' (N) *Lathyrus japonicus, ''Lathyrus japonicus'' var. ''maritimus'' (N) *Lathyrus japonicus, ''Lathyrus japonicus'' var. ''parviflorus'' (N) *''Lathyrus latifolius'' (I) *''Lathyrus ochroleucus'' (N) *''Lathyrus odoratus'' (I) *''Lathyrus palustris'' (N) *''Lathyrus pratensis'' (I) *''Lathyrus tuberosus'' (I) *''Lathyrus venosus'' (N) *''Leavenworthia uniflora'' (N) *Lechea intermedia, ''Lechea intermedia'' var. ''intermedia'' (N) *''Lechea minor'' (N) *''Lechea mucronata'' (N) *Lechea pulchella, ''Lechea pulchella'' var. ''moniliformis'' (N) *Lechea pulchella, ''Lechea pulchella'' var. ''pulchella'' (N) *''Lechea racemulosa'' (N) *''Lechea tenuifolia'' (N) *''Ledum groenlandicum'' (N) *''Leersia lenticularis'' (N) *''Leersia oryzoides'' (N) *''Leersia virginica'' (N) *''Lemna minor'' (N) *''Lemna minuta'' (N) *''Lemna obscura'' (N) *''Lemna perpusilla'' (N) *''Lemna trisulca'' (N) *''Lemna turionifera'' (N) *''Lemna valdiviana'' (N) *Leontodon autumnalis, ''Leontodon autumnalis'' ssp. ''autumnalis'' (I) *Leontodon autumnalis, ''Leontodon autumnalis'' ssp. ''pratensis'' (I) *Leontodon hispidus, ''Leontodon hispidus'' ssp. ''danubialis'' (I) *Leontodon taraxacoides, ''Leontodon taraxacoides'' ssp. ''taraxacoides'' (I) *Leonurus cardiaca, ''Leonurus cardiaca'' ssp. ''cardiaca'' (I) *''Leonurus sibiricus'' (I) *''Lepidium campestre'' (I) *Lepidium densiflorum, ''Lepidium densiflorum'' var. ''densiflorum'' (N) *''Lepidium perfoliatum'' (I) *Lepidium ramosissimum, ''Lepidium ramosissimum'' var. ''bourgeauanum'' (N) *''Lepidium ruderale'' (I) *''Lepidium sativum'' (I) *Lepidium virginicum, ''Lepidium virginicum'' var. ''virginicum'' (N) *Leptochloa fusca, ''Leptochloa fusca'' ssp. ''fascicularis'' (N) *Leptochloa panicea, ''Leptochloa panicea'' ssp. ''brachiata'' (N) *''Lespedeza × acuticarpa'' (N) *''Lespedeza bicolor'' (I) *''Lespedeza × brittonii'' (N) *''Lespedeza capitata'' (N) *''Lespedeza cuneata'' (I) *''Lespedeza formosa'' (I) *''Lespedeza frutescens'' (N) *Lespedeza hirta, ''Lespedeza hirta'' ssp. ''hirta'' (N) *''Lespedeza × nuttallii'' (N) *''Lespedeza procumbens'' (N) *''Lespedeza repens'' (N) *''Lespedeza thunbergii'' (I) *''Lespedeza violacea'' (N) *''Lespedeza virginica'' (N) *''Lesquerella globosa'' (N) *''Leucanthemum maximum'' (I) *''Leucanthemum vulgare'' (I) *Leucojum aestivum, ''Leucojum aestivum'' ssp. ''aestivum'' (I) *''Leucospora multifida'' (N) *''Levisticum officinale'' (I) *Liatris aspera, ''Liatris aspera'' var. ''aspera'' (N) *Liatris aspera, ''Liatris aspera'' var. ''intermedia'' (N) *''Liatris cylindracea'' (N) *Liatris punctata, ''Liatris punctata'' var. ''punctata'' (N) *Liatris pycnostachya, ''Liatris pycnostachya'' var. ''pycnostachya'' (N) *Liatris scariosa, ''Liatris scariosa'' var. ''nieuwlandii'' (N) *''Liatris spheroidea'' (N) *Liatris spicata, ''Liatris spicata'' var. ''spicata'' (N) *Liatris squarrosa, ''Liatris squarrosa'' var. ''squarrosa'' (N) *''Liatris squarrulosa'' (N) *''Ligusticum canadense'' (N) *''Ligustrum obtusifolium'' (I) *''Ligustrum ovalifolium'' (I) *''Ligustrum vulgare'' (I) *Lilium canadense, ''Lilium canadense'' ssp. ''canadense'' (N) *Lilium canadense, ''Lilium canadense'' ssp. ''editorum'' (N) *''Lilium lancifolium'' (I) *''Lilium michiganense'' (N) *Lilium philadelphicum, ''Lilium philadelphicum'' var. ''andinum'' (N) *Lilium philadelphicum, ''Lilium philadelphicum'' var. ''philadelphicum'' (N) *''Lilium superbum'' (N) *Linaria dalmatica, ''Linaria dalmatica'' ssp. ''dalmatica'' (I) *''Linaria genistifolia'' (I) *''Linaria vulgaris'' (I) *Lindera benzoin, ''Lindera benzoin'' var. ''benzoin'' (N) *Lindera benzoin, ''Lindera benzoin'' var. ''pubescens'' (N) *Lindernia dubia, ''Lindernia dubia'' var. ''anagallidea'' (N) *Lindernia dubia, ''Lindernia dubia'' var. ''dubia'' (N) *Linnaea borealis, ''Linnaea borealis'' ssp. ''americana'' (N) *''Linum grandiflorum'' (I) *Linum medium, ''Linum medium'' var. ''texanum'' (N) *''Linum perenne'' (I) *''Linum perenne'' (N) *''Linum striatum'' (N) *Linum sulcatum, ''Linum sulcatum'' var. ''sulcatum'' (N) *''Linum usitatissimum'' (I) *''Linum virginianum'' (N) *''Liparis liliifolia'' (N) *''Liparis loeselii'' (N) *''Lipocarpha drummondii'' (N) *''Lipocarpha micrantha'' (N) *''Liquidambar styraciflua'' (N) *''Liriodendron tulipifera'' (N) *''Lithospermum canescens'' (N) *Lithospermum caroliniense, ''Lithospermum caroliniense'' var. ''croceum'' (N) *''Lithospermum latifolium'' (N) *''Lithospermum officinale'' (I) *''Lobelia cardinalis'' (N) *''Lobelia inflata'' (N) *''Lobelia kalmii'' (N) *Lobelia puberula, ''Lobelia puberula'' var. ''simulans'' (N) *Lobelia siphilitica, ''Lobelia siphilitica'' var. ''siphilitica'' (N) *Lobelia spicata, ''Lobelia spicata'' var. ''campanulata'' (N) *Lobelia spicata, ''Lobelia spicata'' var. ''leptostachys'' (N) *Lobelia spicata, ''Lobelia spicata'' var. ''spicata'' (N) *''Lobularia maritima'' (I) *''Lorinseria areolata'' (N) *Lolium perenne, ''Lolium perenne'' ssp. ''multiflorum'' (I) *Lolium perenne, ''Lolium perenne'' ssp. ''perenne'' (I) *Lolium temulentum, ''Lolium temulentum'' ssp. ''temulentum'' (I) *Lonicera × bella, ''Lonicera'' × ''bella'' (I) *''Lonicera canadensis'' (N) *''Lonicera dioica'' (N) *''Lonicera flava'' (N) *''Lonicera fragrantissima'' (I) *''Lonicera japonica'' (I) *''Lonicera × minutiflora'' (I) *''Lonicera morrowii'' (I) *''Lonicera maackii'' (I) *''Lonicera oblongifolia'' (N) *''Lonicera reticulata'' (N) *''Lonicera ruprechtiana'' (I) *''Lonicera × salicifolia'' (I) *''Lonicera sempervirens'' (N) *''Lonicera tatarica'' (I) *Lonicera villosa, ''Lonicera villosa'' var. ''tonsa'' (N) *''Lonicera × xylosteoides'' (I) *''Lonicera xylosteum'' (I) *Lotus corniculatus, ''Lotus corniculatus'' var. ''corniculatus'' (I) *''Lotus glaber'' (I) *''Ludwigia alternifolia'' (N) *''Ludwigia decurrens'' (N) *''Ludwigia leptocarpa'' (N) *''Ludwigia palustris'' (N) *''Ludwigia peploides'' (I) *Ludwigia peploides, ''Ludwigia peploides'' ssp. ''glabrescens'' (N) *''Ludwigia polycarpa'' (N) *''Lunaria annua'' (I) *Lupinus perennis, ''Lupinus perennis'' ssp. ''perennis'' var. ''occidentalis'' (N) *Lupinus perennis, ''Lupinus perennis'' ssp. ''perennis'' var. ''perennis'' (N) *Lupinus perennis, ''Lupinus perennis'' ssp. ''perennis'' (N) *Luzula acuminata, ''Luzula acuminata'' ssp. ''acuminata'' (N) *Luzula acuminata, ''Luzula acuminata'' ssp. ''carolinae'' (N) *''Luzula bulbosa'' (N) *''Luzula echinata'' (N) *Luzula multiflora, ''Luzula multiflora'' ssp. ''multiflora'' var. ''multiflora'' (N) *Luzula multiflora, ''Luzula multiflora'' ssp. ''multiflora'' (N) *''Lychnis coronaria'' (I) *''Lychnis flos-cuculi'' (I) *''Lychnis viscaria'' (I) *''Lycium barbarum'' (I) *''Lycium chinense'' (I) *''Lycopodiella inundata'' (N) *''Lycopodiella margueritiae'' (N) *''Lycopodiella subappressa'' (N) *''Lycopodium clavatum'' (N) *''Lycopodium dendroideum'' (N) *''Lycopodium digitatum'' (N) *''Lycopodium × habereri'' (N) *''Lycopodium hickeyi'' (N) *''Lycopodium lagopus'' (N) *''Lycopodium obscurum'' (N) *''Lycopodium tristachyum'' (N) *''Lycopus americanus'' (N) *''Lycopus asper'' (N) *''Lycopus europaeus'' (I) *''Lycopus rubellus'' (N) *''Lycopus × sherardii'' (N) *Lycopus uniflorus, ''Lycopus uniflorus'' var. ''uniflorus'' (N) *''Lycopus virginicus'' (N) *''Lycoris squamigera'' (I) *''Lygodium palmatum'' (N) *Lyonia ligustrina, ''Lyonia ligustrina'' var. ''ligustrina'' (N) *''Lysimachia ciliata'' (N) *''Lysimachia lanceolata'' (N) *''Lysimachia nummularia'' (I) *''Lysimachia × producta'' (N) *''Lysimachia punctata'' (I) *''Lysimachia quadriflora'' (N) *''Lysimachia quadrifolia'' (N) *''Lysimachia terrestris'' (N) *''Lysimachia thyrsiflora'' (N) *''Lysimachia vulgaris'' (I) *Lythrum alatum, ''Lythrum alatum'' var. ''alatum'' (N) *''Lythrum hyssopifolia'' (I) *''Lythrum portula'' (I) *''Lythrum salicaria'' (I)

M

*''Macleaya cordata'' (I) *''Maclura pomifera'' (N) *''Magnolia acuminata'' (N) *''Magnolia fraseri'' (N) *''Magnolia macrophylla'' (N) *''Magnolia × soulangeana'' (I) *''Magnolia stellata'' (I) *''Magnolia tripetala'' (N) *''Mahonia aquifolium'' (N) *''Maianthemum canadense'' (N) *Maianthemum racemosum, ''Maianthemum racemosum'' ssp. ''racemosum'' (N) *''Maianthemum stellatum'' (N) *''Maianthemum trifolium'' (N) *''Malaxis unifolia'' (N) *Malus angustifolia, ''Malus angustifolia'' var. ''angustifolia'' (N) *''Malus baccata'' (I) *''Malus coronaria'' (N) *''Malus floribunda'' (I) *Malus ioensis, ''Malus ioensis'' var. ''ioensis'' (N) *''Malus × platycarpa'' (N) *''Malus pumila'' (I) *''Malus toringo'' (I) *''Malus zumi'' (I) *''Malva alcea'' (I) *''Malva moschata'' (I) *''Malva neglecta'' (I) *''Malva pusilla'' (I) *''Malva sylvestris'' (I) *''Malva verticillata'' (I) *''Manfreda virginica'' (N) *''Marrubium vulgare'' (I) *''Marsilea quadrifolia'' (I) *''Marsilea quadrifolia'' (N) *''Matelea obliqua'' (N) *''Matricaria discoidea'' (I) *''Matricaria recutita'' (I) *''Matteuccia struthiopteris'' (N) *''Mazus pumilus'' (I) *''Medeola virginiana'' (N) *''Medicago lupulina'' (I) *''Medicago polymorpha'' (I) *Medicago sativa, ''Medicago sativa'' ssp. ''falcata'' (I) *Medicago sativa, ''Medicago sativa'' ssp. ''sativa'' (I) *''Meehania cordata'' (N) *Melampyrum lineare, ''Melampyrum lineare'' var. ''latifolium'' (N) *Melampyrum lineare, ''Melampyrum lineare'' var. ''lineare'' (N) *''Melica nitens'' (N) *''Melilotus altissimus'' (I) *''Melilotus officinalis'' (I) *''Melissa officinalis'' (I) *''Menispermum canadense'' (N) *''Mentha aquatica'' (I) *''Mentha arvensis'' (N) *''Mentha × gracilis'' (I) *''Mentha × piperita'' (N) *''Mentha × rotundifolia'' (I) *''Mentha spicata'' (I) *''Mentha suaveolens'' (I) *''Mentha × villosa'' (I) *''Menyanthes trifoliata'' (N) *''Mercurialis annua'' (I) *''Mertensia virginica'' (N) *''Microstegium vimineum'' (I) *''Microthlaspi perfoliatum'' (I) *''Mikania scandens'' (N) *Milium effusum, ''Milium effusum'' var. ''cisatlanticum'' (N) *''Mimulus alatus'' (N) *Mimulus ringens, ''Mimulus ringens'' var. ''ringens'' (N) *Minuartia michauxii, ''Minuartia michauxii'' var. ''michauxii'' (N) *''Minuartia patula'' (N) *''Mirabilis albida'' (N) *''Mirabilis hirsuta'' (N) *''Mirabilis jalapa'' (I) *''Mirabilis nyctaginea'' (N) *''Miscanthus sinensis'' (I) *''Misopates orontium'' (I) *''Mitchella repens'' (N) *''Mitella diphylla'' (N) *''Moehringia lateriflora'' (N) *''Moehringia trinervia'' (I) *''Mollugo verticillata'' (N) *''Monarda clinopodia'' (N) *''Monarda didyma'' (N) *Monarda fistulosa, ''Monarda fistulosa'' ssp. ''fistulosa'' var. ''fistulosa'' (N) *Monarda fistulosa, ''Monarda fistulosa'' ssp. ''fistulosa'' var. ''mollis'' (N) *Monarda fistulosa, ''Monarda fistulosa'' ssp. ''fistulosa'' (N) *''Monarda media'' (N) *Monarda punctata, ''Monarda punctata'' ssp. ''punctata'' var. ''villicaulis'' (N) *Monarda punctata, ''Monarda punctata'' ssp. ''punctata'' (N) *''Moneses uniflora'' (N) *''Monolepis nuttalliana'' (N) *''Monotropa hypopithys'' (N) *''Monotropa uniflora'' (N) *''Morella pensylvanica'' (N) *''Morus alba'' (I) *''Morus nigra'' (I) *Morus rubra, ''Morus rubra'' var. ''rubra'' (N) *''Muhlenbergia asperifolia'' (N) *''Muhlenbergia capillaris'' (N) *''Muhlenbergia × curtisetosa'' (N) *''Muhlenbergia cuspidata'' (N) *''Muhlenbergia frondosa'' (N) *''Muhlenbergia glomerata'' (N) *''Muhlenbergia mexicana'' (N) *''Muhlenbergia schreberi'' (N) *''Muhlenbergia sobolifera'' (N) *''Muhlenbergia sylvatica'' (N) *''Muhlenbergia tenuiflora'' (N) *''Muscari armeniacum'' (I) *''Muscari botryoides'' (I) *''Leopoldia comosa, Muscari comosum'' (I) *''Muscari neglectum'' (I) *''Myagrum perfoliatum'' (I) *''Myosotis arvensis'' (I) *''Myosotis discolor'' (I) *''Myosotis laxa'' (N) *''Myosotis macrosperma'' (N) *''Myosotis scorpioides'' (I) *''Myosotis stricta'' (I) *''Myosotis sylvatica'' (I) *''Myosotis verna'' (N) *''Myosoton aquaticum'' (I) *''Myosurus minimus'' (N) *''Myriophyllum aquaticum'' (I) *''Myriophyllum heterophyllum'' (N) *''Myriophyllum humile'' (N) *''Myriophyllum pinnatum'' (N) *''Myriophyllum sibiricum'' (N) *''Myriophyllum spicatum'' (I) *''Myriophyllum verticillatum'' (N)

N

*''Najas flexilis'' (N) *''Najas gracillima'' (N) *Najas guadalupensis, ''Najas guadalupensis'' ssp. ''guadalupensis'' (N) *''Najas marina'' (N) *''Najas minor'' (I) *''Napaea dioica'' (N) *''Narcissus × incomparabilis'' (I) *''Narcissus jonquilla'' (I) *''Narcissus × medioluteus'' (I) *''Narcissus poeticus'' (I) *''Narcissus pseudonarcissus'' (I) *''Nasturtium officinale'' (I) *Navarretia intertexta, ''Navarretia intertexta'' ssp. ''propinqua'' (N) *''Nelumbo lutea'' (N) *''Nelumbo nucifera'' (I) *''Neobeckia aquatica'' (N) *Neottia cordata, ''Neottia cordata'' var. ''cordata'' (N) *''Nepeta cataria'' (I) *''Neslia paniculata'' (I) *''Nicandra physalodes'' (I) *''Nicotiana alata'' (I) *''Nicotiana glauca'' (I) *''Nicotiana rustica'' (I) *''Nicotiana tabacum'' (I) *''Nigella damascena'' (I) *''Nothoscordum bivalve'' (N) *Nuphar lutea, ''Nuphar lutea'' ssp. ''advena'' (N) *Nuphar lutea, ''Nuphar lutea'' ssp. ''variegata'' (N) *''Nuttallanthus canadensis'' (N) *Nymphaea odorata, ''Nymphaea odorata'' ssp. ''odorata'' (N) *Nymphaea odorata, ''Nymphaea odorata'' ssp. ''tuberosa'' (N) *''Nymphoides peltata'' (I) *''Nyssa sylvatica'' (N)

O

*''Obolaria virginica'' (N) *''Oclemena acuminata'' (N) *''Oenanthe aquatica'' (I) *''Oenothera biennis'' (N) *''Oenothera clelandii'' (N) *Oenothera fruticosa, ''Oenothera fruticosa'' ssp. ''fruticosa'' (N) *Oenothera fruticosa, ''Oenothera fruticosa'' ssp. ''glauca'' (N) *''Oenothera laciniata'' (N) *''Oenothera nutans'' (N) *''Oenothera oakesiana'' (N) *''Oenothera parviflora'' (N) *''Oenothera perennis'' (N) *Oenothera pilosella, ''Oenothera pilosella'' ssp. ''pilosella'' (N) *''Oenothera speciosa'' (N) *''Oenothera triloba'' (N) *Oenothera villosa, ''Oenothera villosa'' ssp. ''villosa'' (N) *''Oligoneuron album'' (N) *''Oligoneuron ohioense'' (N) *''Oligoneuron riddellii'' (N) *Oligoneuron rigidum, ''Oligoneuron rigidum'' var. ''glabratum'' (N) *Oligoneuron rigidum, ''Oligoneuron rigidum'' var. ''rigidum'' (N) *''Onoclea sensibilis'' (N) *''Onopordum acanthium'' (I) *Onosmodium bejariense, ''Onosmodium bejariense'' var. ''hispidissimum'' (N) *''Ophioglossum engelmannii'' (N) *''Ophioglossum pusillum'' (N) *''Ophioglossum vulgatum'' (N) *''Opuntia humifusa'' (N) *Opuntia macrorhiza, ''Opuntia macrorhiza'' var. ''macrorhiza'' (N) *''Orbexilum onobrychis'' (N) *Orbexilum pedunculatum, ''Orbexilum pedunculatum'' var. ''pedunculatum'' (N) *''Origanum vulgare'' (I) *''Ornithogalum nutans'' (I) *''Ornithogalum umbellatum'' (I) *Orobanche ludoviciana, ''Orobanche ludoviciana'' ssp. ''ludoviciana'' (N) *''Orobanche uniflora'' (N) *''Orthilia secunda'' (N) *''Oryzopsis asperifolia'' (N) *''Osmorhiza claytonii'' (N) *''Osmorhiza longistylis'' (N) *Osmundastrum cinnamomeum, ''Osmunda cinnamomea'' var. ''cinnamomea'' (N) *''Osmunda claytoniana'' (N) *Osmunda spectabilis, ''Osmunda regalis'' var. ''spectabilis'' (N) *Ostrya virginiana, ''Ostrya virginiana'' var. ''virginiana'' (N) *''Oxalis corniculata'' (N) *''Oxalis dillenii'' (N) *''Oxalis grandis'' (N) *''Oxalis montana'' (N) *''Oxalis stricta'' (N) *''Oxalis violacea'' (N) *''Oxydendrum arboreum'' (N) *''Oxypolis rigidior'' (N)

P

*''Pachysandra terminalis'' (I) *''Packera anonyma'' (N) *''Packera aurea'' (N) *''Packera glabella'' (N) *''Packera obovata'' (N) *''Packera paupercula'' (N) *''Packera plattensis'' (N) *''Panax quinquefolius'' (N) *''Panax trifolius'' (N) *''Panicum anceps'' (N) *''Panicum capillare'' (N) *Panicum dichotomiflorum, ''Panicum dichotomiflorum'' var. ''dichotomiflorum'' (N) *''Panicum flexile'' (N) *''Panicum gattingeri'' (N) *Panicum miliaceum, ''Panicum miliaceum'' ssp. ''miliaceum'' (I) *''Panicum philadelphicum'' (N) *Panicum rigidulum, ''Panicum rigidulum'' var. ''elongatum'' (N) *Panicum rigidulum, ''Panicum rigidulum'' var. ''pubescens'' (N) *Panicum rigidulum, ''Panicum rigidulum'' var. ''rigidulum'' (N) *''Panicum verrucosum'' (N) *Panicum virgatum, ''Panicum virgatum'' var. ''virgatum'' (N) *''Papaver argemone'' (I) *''Papaver dubium'' (I) *''Papaver rhoeas'' (I) *''Papaver somniferum'' (I) *''Parietaria pensylvanica'' (N) *''Parnassia glauca'' (N) *''Paronychia canadensis'' (N) *Paronychia fastigiata, ''Paronychia fastigiata'' var. ''fastigiata'' (N) *''Parthenium hysterophorus'' (I) *Parthenium integrifolium, ''Parthenium integrifolium'' var. ''integrifolium'' (N) *''Parthenocissus quinquefolia'' (N) *''Parthenocissus tricuspidata'' (I) *''Parthenocissus vitacea'' (N) *''Pascopyrum, Pascopyrum smithii'' (N) *''Paspalum floridanum'' (N) *''Paspalum fluitans'' (N) *''Paspalum laeve'' (N) *''Paspalum pubiflorum'' (N) *''Paspalum setaceum'' (N) *''Passiflora incarnata'' (N) *''Passiflora lutea'' (N) *''Pastinaca sativa'' (I) *''Paulownia tomentosa'' (I) *''Paxistima canbyi'' (N) *Pedicularis canadensis, ''Pedicularis canadensis'' ssp. ''canadensis'' (N) *''Pedicularis lanceolata'' (N) *''Pellaea atropurpurea'' (N) *Pellaea glabella, ''Pellaea glabella'' ssp. ''glabella'' (N) *''Peltandra virginica'' (N) *''Pennisetum glaucum'' (I) *''Penstemon alluviorum'' (N) *''Penstemon calycosus'' (N) *''Penstemon canescens'' (N) *''Penstemon cobaea'' (N) *''Penstemon digitalis'' (N) *''Penstemon grandiflorus'' (N) *''Penstemon hirsutus'' (N) *''Penstemon laevigatus'' (N) *''Penstemon pallidus'' (N) *Penstemon tubiflorus, ''Penstemon tubiflorus'' var. ''tubiflorus'' (N) *''Penthorum sedoides'' (N) *''Perideridia americana'' (N) *Perilla frutescens, ''Perilla frutescens'' var. ''frutescens'' (I) *''Petasites hybridus'' (I) *''Petrorhagia prolifera'' (I) *''Petrorhagia saxifraga'' (I) *''Petroselinum crispum'' (I) *''Petunia × atkinsiana'' (I) *''Petunia axillaris'' (I) *''Phacelia bipinnatifida'' (N) *Phacelia dubia, ''Phacelia dubia'' var. ''dubia'' (N) *''Phacelia purshii'' (N) *''Phacelia ranunculacea'' (N) *''Phalaris arundinacea'' (N) *''Phalaris canariensis'' (I) *''Phalaris caroliniana'' (N) *''Phaseolus coccineus'' (I) *Phaseolus polystachios, ''Phaseolus polystachios'' var. ''polystachios'' (N) *''Phaseolus vulgaris'' (I) *''Phegopteris connectilis'' (N) *''Phegopteris hexagonoptera'' (N) *''Phellodendron amurense'' (I) *''Philadelphus coronarius'' (I) *''Philadelphus inodorus'' (N) *Philadelphus pubescens, ''Philadelphus pubescens'' var. ''pubescens'' (N) *''Philadelphus tomentosus'' (I) *''Phleum pratense'' (I) *Phlox divaricata, ''Phlox divaricata'' ssp. ''divaricata'' (N) *Phlox glaberrima, ''Phlox glaberrima'' ssp. ''triflora'' (N) *''Phlox latifolia'' (N) *Phlox maculata, ''Phlox maculata'' ssp. ''maculata'' (N) *Phlox maculata, ''Phlox maculata'' ssp. ''pyramidalis'' (N) *''Phlox paniculata'' (N) *Phlox pilosa, ''Phlox pilosa'' ssp. ''pilosa'' (N) *''Phlox stolonifera'' (N) *Phlox subulata, ''Phlox subulata'' ssp. ''brittonii'' (N) *Phlox subulata, ''Phlox subulata'' ssp. ''subulata'' (N) *''Phoradendron leucarpum'' (N) *''Photinia floribunda'' (N) *''Photinia melanocarpa'' (N) *''Phragmites australis'' (N) *''Phryma leptostachya'' (N) *''Phyla lanceolata'' (N) *Phyllanthus caroliniensis, ''Phyllanthus caroliniensis'' ssp. ''caroliniensis'' (N) *''Physalis alkekengi'' (I) *''Physalis grisea'' (N) *Physalis heterophylla, ''Physalis heterophylla'' var. ''heterophylla'' (N) *''Physalis hispida'' (N) *Physalis longifolia, ''Physalis longifolia'' var. ''longifolia'' (N) *Physalis longifolia, ''Physalis longifolia'' var. ''subglabrata'' (N) *Physalis philadelphica, ''Physalis philadelphica'' var. ''immaculata'' (I) *Physalis pubescens, ''Physalis pubescens'' var. ''integrifolia'' (N) *Physalis pubescens, ''Physalis pubescens'' var. ''pubescens'' (N) *Physalis virginiana, ''Physalis virginiana'' var. ''virginiana'' (N) *Physocarpus opulifolius, ''Physocarpus opulifolius'' var. ''intermedius'' (N) *Physocarpus opulifolius, ''Physocarpus opulifolius'' var. ''opulifolius'' (N) *Physostegia virginiana, ''Physostegia virginiana'' ssp. ''praemorsa'' (N) *Physostegia virginiana, ''Physostegia virginiana'' ssp. ''virginiana'' (N) *Phytolacca americana, ''Phytolacca americana'' var. ''americana'' (N) *''Picea abies'' (I) *''Picris echioides'' (I) *''Picris hieracioides'' (N) *Picris hieracioides, ''Picris hieracioides'' ssp. ''hieracioides'' (I) *''Pilea fontana'' (N) *Pilea pumila, ''Pilea pumila'' var. ''pumila'' (N) *Pimpinella saxifraga, ''Pimpinella saxifraga'' ssp. ''saxifraga'' (I) *''Pinellia ternata'' (I) *''Pinus banksiana'' (N) *''Pinus echinata'' (N) *''Pinus nigra'' (I) *''Pinus rigida'' (N) *''Pinus strobus'' (N) *''Pinus sylvestris'' (I) *''Pinus virginiana'' (N) *''Piptatherum racemosum'' (N) *''Piptochaetium avenaceum'' (N) *''Pistia stratiotes'' (N) *Pityopsis graminifolia, ''Pityopsis graminifolia'' var. ''latifolia'' (N) *''Plantago aristata'' (N) *''Plantago cordata'' (N) *''Plantago lanceolata'' (I) *''Plantago major'' (I) *''Plantago patagonica'' (N) *''Plantago psyllium'' (I) *Plantago rugelii, ''Plantago rugelii'' var. ''rugelii'' (N) *''Plantago virginica'' (N) *''Platanthera × andrewsii'' (N) *''Platanthera aquilonis'' (N) *Platanthera blephariglottis, ''Platanthera blephariglottis'' var. ''blephariglottis'' (N) *''Platanthera ciliaris'' (N) *''Platanthera clavellata'' (N) *Platanthera flava, ''Platanthera flava'' var. ''herbiola'' (N) *''Platanthera grandiflora'' (N) *''Platanthera hookeri'' (N) *''Platanthera lacera'' (N) *''Platanthera leucophaea'' (N) *''Platanthera orbiculata'' (N) *''Platanthera peramoena'' (N) *''Platanthera psycodes'' (N) *''Platanus occidentalis'' (N) *Pleopeltis polypodioides, ''Pleopeltis polypodioides'' ssp. ''michauxiana'' (N) *''Pluchea camphorata'' (N) *''Poa alsodes'' (N) *''Poa annua'' (I) *''Poa arida'' (N) *''Poa bulbosa'' (I) *''Poa chapmaniana'' (N) *''Poa compressa'' (I) *''Poa cuspidata'' (N) *''Poa nemoralis'' (N) *Poa nemoralis, ''Poa nemoralis'' ssp. ''nemoralis'' (I) *''Poa paludigena'' (N) *''Poa palustris'' (N) *''Poa pratensis'' (I) *Poa pratensis, ''Poa pratensis'' ssp. ''pratensis'' (N) *''Poa saltuensis'' (N) *''Poa sylvestris'' (N) *''Poa trivialis'' (I) *''Poa wolfii'' (N) *''Podophyllum peltatum'' (N) *''Podostemum ceratophyllum'' (N) *''Pogonia ophioglossoides'' (N) *Polanisia dodecandra, ''Polanisia dodecandra'' ssp. ''dodecandra'' (N) *Polanisia dodecandra, ''Polanisia dodecandra'' ssp. ''trachysperma'' (N) *''Polanisia jamesii'' (N) *''Polemonium caeruleum'' (I) *Polemonium reptans, ''Polemonium reptans'' var. ''reptans'' (N) *Polemonium reptans, ''Polemonium reptans'' var. ''villosum'' (N) *''Polygala ambigua'' (N) *Polygala cruciata, ''Polygala cruciata'' var. ''aquilonia'' (N) *''Polygala curtissii'' (N) *''Polygala incarnata'' (N) *''Polygala paucifolia'' (N) *''Polygala polygama'' (N) *''Polygala sanguinea'' (N) *''Polygala senega'' (N) *Polygala verticillata, ''Polygala verticillata'' var. ''isocycla'' (N) *Polygala verticillata, ''Polygala verticillata'' var. ''verticillata'' (N) *Polygonatum biflorum, ''Polygonatum biflorum'' var. ''commutatum'' (N) *''Polygonatum pubescens'' (N) *''Polygonum achoreum'' (N) *Polygonum amphibium, ''Polygonum amphibium'' var. ''emersum'' (N) *Polygonum amphibium, ''Polygonum amphibium'' var. ''stipulaceum'' (N) *''Polygonum arenastrum'' (I) *''Polygonum arifolium'' (N) *''Polygonum aviculare'' (I) *''Polygonum buxiforme'' (N) *''Polygonum careyi'' (N) *Polygonum cespitosum, ''Polygonum cespitosum'' var. ''longisetum'' (I) *''Polygonum ciliinode'' (N) *Polygonum convolvulus, ''Polygonum convolvulus'' var. ''convolvulus'' (I) *''Polygonum erectum'' (N) *Polygonum fowleri, ''Polygonum fowleri'' ssp. ''fowleri'' (N) *''Polygonum hydropiper'' (I) *''Polygonum hydropiperoides'' (N) *''Polygonum lapathifolium'' (N) *''Polygonum orientale'' (I) *''Polygonum pensylvanicum'' (N) *''Polygonum perfoliatum'' (I) *''Polygonum persicaria'' (I) *Polygonum punctatum, ''Polygonum punctatum'' var. ''confertiflorum'' (N) *Polygonum punctatum, ''Polygonum punctatum'' var. ''punctatum'' (N) *Polygonum ramosissimum, ''Polygonum ramosissimum'' var. ''ramosissimum'' (N) *''Polygonum robustius'' (N) *''Polygonum sachalinense'' (I) *''Polygonum sagittatum'' (N) *Polygonum scandens, ''Polygonum scandens'' var. ''cristatum'' (N) *Polygonum scandens, ''Polygonum scandens'' var. ''dumetorum'' (N) *Polygonum scandens, ''Polygonum scandens'' var. ''scandens'' (N) *Polygonum scandens, ''Polygonum scandens'' var. ''dumetorum'' (I) *''Polygonum setaceum'' (N) *''Polygonum tenue'' (N) *''Polygonum virginianum'' (N) *''Polymnia canadensis'' (N) *''Polypodium appalachianum'' (N) *''Polypodium virginianum'' (N) *Polystichum acrostichoides, ''Polystichum acrostichoides'' var. ''acrostichoides'' (N) *''Pontederia cordata'' (N) *''Populus alba'' (I) *Populus balsamifera, ''Populus balsamifera'' ssp. ''balsamifera'' (N) *''Populus × canadensis'' (N) *''Populus × canescens'' (I) *Populus deltoides, ''Populus deltoides'' ssp. ''deltoides'' (N) *Populus deltoides, ''Populus deltoides'' ssp. ''monilifera'' (N) *''Populus grandidentata'' (N) *''Populus heterophylla'' (N) *''Populus × jackii'' (N) *''Populus nigra'' (I) *''Populus × smithii'' (N) *''Populus tremuloides'' (N) *''Portulaca grandiflora'' (I) *''Portulaca oleracea'' (I) *''Portulaca oleracea'' (N) *''Potamogeton amplifolius'' (N) *''Potamogeton compressus'' (N) *''Potamogeton crispus'' (I) *''Potamogeton diversifolius'' (N) *''Potamogeton epihydrus'' (N) *Potamogeton foliosus, ''Potamogeton foliosus'' ssp. ''foliosus'' (N) *''Potamogeton friesii'' (N) *''Potamogeton gramineus'' (N) *''Potamogeton × hagstroemii'' (N) *''Potamogeton hillii'' (N) *''Potamogeton illinoensis'' (N) *''Potamogeton natans'' (N) *''Potamogeton nodosus'' (N) *''Potamogeton perfoliatus'' (N) *''Potamogeton praelongus'' (N) *''Potamogeton pulcher'' (N) *Potamogeton pusillus, ''Potamogeton pusillus'' ssp. ''pusillus'' (N) *Potamogeton pusillus, ''Potamogeton pusillus'' ssp. ''tenuissimus'' (N) *''Potamogeton × rectifolius'' (N) *''Potamogeton richardsonii'' (N) *''Potamogeton robbinsii'' (N) *''Potamogeton spirillus'' (N) *''Potamogeton strictifolius'' (N) *''Potamogeton tennesseensis'' (N) *''Potamogeton vaseyi'' (N) *Potentilla argentea, ''Potentilla argentea'' var. ''argentea'' (I) *Potentilla arguta, ''Potentilla arguta'' ssp. ''arguta'' (N) *Potentilla canadensis, ''Potentilla canadensis'' var. ''canadensis'' (N) *Potentilla canadensis, ''Potentilla canadensis'' var. ''villosissima'' (N) *''Potentilla inclinata'' (I) *''Potentilla intermedia'' (I) *Potentilla norvegica ssp. monspeliensis, ''Potentilla norvegica'' ssp. ''monspeliensis'' (N) *''Potentilla paradoxa'' (N) *Potentilla pensylvanica, ''Potentilla pensylvanica'' var. ''pensylvanica'' (N) *''Potentilla recta'' (I) *''Potentilla reptans'' (I) *''Potentilla simplex'' (N) *''Prenanthes alba'' (N) *''Prenanthes altissima'' (N) *''Prenanthes aspera'' (N) *''Prenanthes crepidinea'' (N) *Prenanthes racemosa, ''Prenanthes racemosa'' var. ''racemosa'' (N) *''Prenanthes serpentaria'' (N) *''Prenanthes trifoliolata'' (N) *Proboscidea louisianica, ''Proboscidea louisianica'' ssp. ''louisianica'' (N) *''Prosartes lanuginosa'' (N) *''Prosartes maculata'' (N) *Proserpinaca palustris, ''Proserpinaca palustris'' var. ''amblyogona'' (N) *Proserpinaca palustris, ''Proserpinaca palustris'' var. ''crebra'' (N) *''Prunella laciniata'' (I) *Prunella vulgaris, ''Prunella vulgaris'' ssp. ''lanceolata'' (N) *''Prunus americana'' (N) *''Prunus avium'' (I) *''Prunus cerasifera'' (I) *''Prunus cerasus'' (I) *Prunus domestica, ''Prunus domestica'' var. ''domestica'' (I) *''Prunus hortulana'' (N) *''Prunus mahaleb'' (I) *''Prunus mexicana'' (N) *''Prunus munsoniana'' (N) *''Prunus nigra'' (N) *Prunus pensylvanica, ''Prunus pensylvanica'' var. ''pensylvanica'' (N) *Prunus persica, ''Prunus persica'' var. ''persica'' (I) *Prunus pumila, ''Prunus pumila'' var. ''pumila'' (N) *Prunus serotina, ''Prunus serotina'' var. ''serotina'' (N) *''Prunus subhirtella'' (I) *''Prunus susquehanae'' (N) (here considered a synonym of ''Prunus pumila, P. pumila'') *''Prunus tomentosa'' (I) *Prunus virginiana, ''Prunus virginiana'' var. ''virginiana'' (N) *''Psammophiliella muralis'' (syn. ''Gypsophila muralis'') (I) *''Pseudognaphalium macounii'' (N) *Pseudognaphalium obtusifolium, ''Pseudognaphalium obtusifolium'' ssp. ''obtusifolium'' (N) *''Pseudolysimachion longifolium'' (I) *Ptelea trifoliata, ''Ptelea trifoliata'' ssp. ''trifoliata'' var. ''trifoliata'' (N) *Ptelea trifoliata, ''Ptelea trifoliata'' ssp. ''trifoliata'' (N) *Pteridium aquilinum, ''Pteridium aquilinum'' var. ''latiusculum'' (N) *Pteridium aquilinum, ''Pteridium aquilinum'' var. ''pseudocaudatum'' (N) *''Puccinellia distans'' (N) *Puccinellia distans, ''Puccinellia distans'' ssp. ''distans'' (I) *Pueraria montana, ''Pueraria montana'' var. ''lobata'' (I) *Pycnanthemum incanum, ''Pycnanthemum incanum'' var. ''incanum'' (N) *Pycnanthemum incanum, ''Pycnanthemum incanum'' var. ''puberulum'' (N) *''Pycnanthemum muticum'' (N) *Pycnanthemum pycnanthemoides, ''Pycnanthemum pycnanthemoides'' var. ''pycnanthemoides'' (N) *''Pycnanthemum tenuifolium'' (N) *Pycnanthemum verticillatum, ''Pycnanthemum verticillatum'' var. ''pilosum'' (N) *Pycnanthemum verticillatum, ''Pycnanthemum verticillatum'' var. ''verticillatum'' (N) *''Pycnanthemum virginianum'' (N) *''Pyracantha coccinea'' (I) *''Pyracantha coccinea'' (N) *''Pyrola americana'' (N) *Pyrola asarifolia, ''Pyrola asarifolia'' ssp. ''asarifolia'' (N) *''Pyrola chlorantha'' (N) *''Pyrola elliptica'' (N) *''Pyrus calleryana'' (I) *''Pyrus communis'' (I)

Q

*''Quercus alba'' (N) *''Quercus × bebbiana'' (N) *''Quercus bicolor'' (N) *''Quercus × bushii'' (N) *Quercus coccinea, ''Quercus coccinea'' var. ''coccinea'' (N) *Quercus coccinea, ''Quercus coccinea'' var. ''tuberculata'' (N) *''Quercus × deamii'' (N) *''Quercus ellipsoidalis'' (N) *''Quercus × exacta'' (N) *''Quercus falcata'' (N) *''Quercus × fontana'' (N) *''Quercus × hawkinsiae'' (N) *''Quercus imbricaria'' (N) *''Quercus × jackiana'' (N) *''Quercus × leana'' (N) *Quercus macrocarpa, ''Quercus macrocarpa'' var. ''macrocarpa'' (N) *Quercus marilandica, ''Quercus marilandica'' var. ''marilandica'' (N) *''Quercus muehlenbergii'' (N) *''Quercus × mutabilis'' (N) *''Quercus × palaeolithicola'' (N) *''Quercus palustris'' (N) *''Quercus prinus'' (N) *''Quercus robur'' (I) *Quercus rubra, ''Quercus rubra'' var. ''ambigua'' (N) *Quercus rubra, ''Quercus rubra'' var. ''rubra'' (N) *''Quercus × runcinata'' (N) *''Quercus × saulii'' (N) *''Quercus × schuettei'' (N) *Quercus shumardii, ''Quercus shumardii'' var. ''schneckii'' (N) *Quercus shumardii, ''Quercus shumardii'' var. ''shumardii'' (N) *''Quercus stellata'' (N) *''Quercus × tridentata'' (N) *''Quercus velutina'' (N)

R

*''Ranunculus abortivus'' (N) *Ranunculus acris, ''Ranunculus acris'' var. ''acris'' (N) *Ranunculus acris, ''Ranunculus acris'' var. ''acris'' (I) *''Ranunculus allegheniensis'' (N) *''Ranunculus ambigens'' (N) *''Ranunculus arvensis'' (I) *''Ranunculus bulbosus'' (I) *''Ranunculus fascicularis'' (N) *Ranunculus ficaria, ''Ranunculus ficaria'' var. ''bulbifera'' (I) *''Ranunculus flabellaris'' (N) *Ranunculus hispidus, ''Ranunculus hispidus'' var. ''caricetorum'' (N) *Ranunculus hispidus, ''Ranunculus hispidus'' var. ''hispidus'' (N) *Ranunculus hispidus, ''Ranunculus hispidus'' var. ''nitidus'' (N) *''Ranunculus longirostris'' (N) *''Ranunculus micranthus'' (N) *''Ranunculus parviflorus'' (I) *''Ranunculus pensylvanicus'' (N) *Ranunculus pusillus, ''Ranunculus pusillus'' var. ''pusillus'' (N) *Ranunculus recurvatus, ''Ranunculus recurvatus'' var. ''recurvatus'' (N) *''Ranunculus repens'' (I) *Ranunculus sceleratus, ''Ranunculus sceleratus'' var. ''sceleratus'' (N) *''Raphanus raphanistrum'' (I) *''Raphanus sativus'' (I) *''Ratibida columnifera'' (N) *''Ratibida pinnata'' (N) *''Reseda alba'' (I) *''Reseda lutea'' (I) *''Reseda luteola'' (I) *''Reynoutria japonica'' (Synonym (taxonomy), syn. ''Polygonum cuspidatum'') (I) *''Rhamnus alnifolia'' (N) *''Rhamnus cathartica'' (I) *Rhamnus davurica, ''Rhamnus davurica'' ssp. ''davurica'' (I) *Rhamnus lanceolata, ''Rhamnus lanceolata'' ssp. ''glabrata'' (N) *Rhamnus lanceolata, ''Rhamnus lanceolata'' ssp. ''lanceolata'' (N) *''Rhamnus utilis'' (I) *''Rheum rhabarbarum'' (I) *''Rhexia virginica'' (N) *''Rhododendron calendulaceum'' (N) *''Rhododendron maximum'' (N) *''Rhododendron periclymenoides'' (N) *''Rhododendron prinophyllum'' (N) *''Rhodotypos scandens'' (I) *Rhus aromatica, ''Rhus aromatica'' var. ''arenaria'' (N) *Rhus aromatica, ''Rhus aromatica'' var. ''aromatica'' (N) *Rhus copallinum, ''Rhus copallinum'' var. ''latifolia'' (N) *''Rhus glabra'' (N) *''Rhus pulvinata'' (N) *''Rhus typhina'' (N) *''Rhynchospora alba'' (N) *''Rhynchospora capillacea'' (N) *''Rhynchospora capitellata'' (N) *''Rhynchospora recognita'' (N) *''Ribes americanum'' (N) *Ribes aureum, ''Ribes aureum'' var. ''villosum'' (N) *''Ribes cynosbati'' (N) *''Ribes glandulosum'' (N) *''Ribes hirtellum'' (N) *''Ribes missouriense'' (N) *''Ribes nigrum'' (I) *Ribes oxyacanthoides, ''Ribes oxyacanthoides'' ssp. ''oxyacanthoides'' (N) *''Ribes rotundifolium'' (N) *''Ribes rubrum'' (I) *''Ribes triste'' (N) *Ribes uva-crispa, ''Ribes uva-crispa'' var. ''sativum'' (I) *''Ricinus communis'' (I) *''Robinia × ambigua'' (N) *Robinia hispida, ''Robinia hispida'' var. ''fertilis'' (N) *Robinia hispida, ''Robinia hispida'' var. ''hispida'' (N) *''Robinia pseudoacacia'' (N) *Robinia viscosa, ''Robinia viscosa'' var. ''viscosa'' (N) *Rorippa palustris, ''Rorippa palustris'' ssp. ''fernaldiana'' (N) *Rorippa palustris, ''Rorippa palustris'' ssp. ''hispida'' (N) *''Rorippa sessiliflora'' (N) *''Rorippa sylvestris'' (I) *Rosa arkansana, ''Rosa arkansana'' var. ''suffulta'' (N) *Rosa blanda, ''Rosa blanda'' var. ''blanda'' (N) *''Rosa canina'' (I) *Rosa carolina, ''Rosa carolina'' var. ''carolina'' (N) *''Rosa centifolia'' (I) *''Rosa cinnamomea'' (I) *''Rosa eglanteria'' (I) *''Rosa gallica'' (I) *''Rosa majalis'' (I) *''Rosa micrantha'' (I) *''Rosa multiflora'' (I) *''Rosa nitida'' (N) *''Rosa × palustriformis'' (N) *''Rosa palustris'' (N) *''Rosa pimpinellifolia'' (I) *''Rosa × rudiuscula'' (N) *''Rosa rugosa'' (I) *Rosa setigera, ''Rosa setigera'' var. ''setigera'' (N) *Rosa setigera, ''Rosa setigera'' var. ''tomentosa'' (N) *''Rosa wichuraiana'' (I) *''Rotala ramosior'' (N) *''Rubus aboriginum'' (N) *Rubus allegheniensis, ''Rubus allegheniensis'' var. ''allegheniensis'' (N) *Rubus allegheniensis, ''Rubus allegheniensis'' var. ''gravesii'' (N) *''Rubus alumnus'' (N) *''Rubus argutus'' (N) *''Rubus armeniacus'' (I) *''Rubus baileyanus'' (N) *''Rubus bellobatus'' (N) *''Rubus canadensis'' (N) *''Rubus deamii'' (N) *''Rubus depavitus'' (N) *''Rubus fecundus'' (N) *''Rubus flagellaris'' (N) *''Rubus frondosus'' (N) *''Rubus hispidus'' (N) *Rubus idaeus, ''Rubus idaeus'' ssp. ''strigosus'' (N) *Rubus idaeus, ''Rubus idaeus'' ssp. ''idaeus'' (I) *''Rubus invisus'' (N) *''Rubus laciniatus'' (I) *''Rubus laudatus'' (N) *''Rubus meracus'' (N) *''Rubus michiganensis'' (N) *''Rubus multifer'' (N) *''Rubus occidentalis'' (N) *Rubus odoratus, ''Rubus odoratus'' var. ''odoratus'' (N) *''Rubus pensilvanicus'' (N) *''Rubus pergratus'' (N) *''Rubus philadelphicus'' (N) *''Rubus phoenicolasius'' (I) *''Rubus plicatifolius'' (N) *''Rubus prestonensis'' (N) *Rubus pubescens, ''Rubus pubescens'' var. ''pubescens'' (N) *''Rubus recurvans'' (N) *''Rubus recurvicaulis'' (N) *''Rubus roribaccus'' (N) *''Rubus rosa'' (N) *''Rubus setosus'' (N) *''Rubus suus'' (N) *''Rubus trivialis'' (N) *''Rubus uvidus'' (N) *''Rubus vagus'' (N) *Rudbeckia fulgida, ''Rudbeckia fulgida'' var. ''deamii'' (N) *Rudbeckia fulgida, ''Rudbeckia fulgida'' var. ''fulgida'' (N) *Rudbeckia fulgida, ''Rudbeckia fulgida'' var. ''speciosa'' (N) *Rudbeckia fulgida, ''Rudbeckia fulgida'' var. ''umbrosa'' (N) *Rudbeckia grandiflora, ''Rudbeckia grandiflora'' var. ''grandiflora'' (N) *Rudbeckia hirta, ''Rudbeckia hirta'' var. ''hirta'' (N) *Rudbeckia hirta, ''Rudbeckia hirta'' var. ''pulcherrima'' (N) *Rudbeckia laciniata, ''Rudbeckia laciniata'' var. ''laciniata'' (N) *Rudbeckia triloba, ''Rudbeckia triloba'' var. ''triloba'' (N) *Ruellia caroliniensis, ''Ruellia caroliniensis'' ssp. ''caroliniensis'' var. ''caroliniensis'' (N) *Ruellia caroliniensis, ''Ruellia caroliniensis'' ssp. ''caroliniensis'' (N) *''Ruellia humilis'' (N) *''Ruellia strepens'' (N) *''Rumex acetosa'' (N) *Rumex acetosa, ''Rumex acetosa'' ssp. ''acetosa'' (I) *''Rumex acetosella'' (I) *''Rumex × acutus'' (I) *''Rumex × acutus'' (N) *''Rumex altissimus'' (N) *''Rumex conglomeratus'' (I) *Rumex crispus, ''Rumex crispus'' ssp. ''crispus'' (I) *''Rumex maritimus'' (N) *''Rumex obtusifolius'' (I) *Rumex orbiculatus, ''Rumex orbiculatus'' var. ''borealis'' (N) *Rumex orbiculatus, ''Rumex orbiculatus'' var. ''orbiculatus'' (N) *''Rumex patientia'' (I) *Rumex salicifolius, ''Rumex salicifolius'' var. ''mexicanus'' (N) *''Rumex verticillatus'' (N) *''Ruppia cirrhosa'' (N)

S

*''Sabatia angularis'' (N) *''Saccharum alopecuroides'' (N) *''Saccharum ravennae'' (I) *Sagina decumbens, ''Sagina decumbens'' ssp. ''decumbens'' (N) *''Sagina japonica'' (I) *''Sagina procumbens'' (I) *''Sagina procumbens'' (N) *''Sagittaria australis'' (N) *''Sagittaria brevirostra'' (N) *Sagittaria calycina, ''Sagittaria calycina'' var. ''calycina'' (N) *''Sagittaria cuneata'' (N) *Sagittaria graminea, ''Sagittaria graminea'' var. ''graminea'' (N) *''Sagittaria latifolia'' (N) *''Sagittaria platyphylla'' (N) *''Sagittaria rigida'' (N) *''Salicornia depressa'' (N) *''Salicornia maritima'' (N) *''Salix alba'' (I) *''Salix amygdaloides'' (N) *''Salix bebbiana'' (N) *''Salix candida'' (N) *''Salix caprea'' (I) *''Salix caroliniana'' (N) *''Salix cinerea'' (I) *''Salix discolor'' (N) *''Salix × ehrhartiana'' (I) *''Salix × ehrhartiana'' (N) *''Salix eriocephala'' (N) *''Salix × fragilis, Salix fragilis'' (I) *''Salix × glatfelteri'' (N) *Salix humilis, ''Salix humilis'' var. ''humilis'' (N) *Salix humilis, ''Salix humilis'' var. ''tristis'' (N) *''Salix interior'' (N) *Salix lucida, ''Salix lucida'' ssp. ''lucida'' (N) *''Salix matsudana'' (I) *Salix myricoides, ''Salix myricoides'' var. ''albovestita'' (N) *Salix myricoides, ''Salix myricoides'' var. ''myricoides'' (N) *''Salix nigra'' (N) *''Salix pedicellaris'' (N) *''Salix × pendulina'' (I) *''Salix pentandra'' (I) *''Salix petiolaris'' (N) *''Salix purpurea'' (I) *''Salix × rubens'' (I) *''Salix sericea'' (N) *''Salix serissima'' (N) *''Salix viminalis'' (I) *''Salsola collina'' (I) *''Salsola tragus'' (I) *Salvia azurea, ''Salvia azurea'' var. ''grandiflora'' (N) *''Salvia coccinea'' (N) *''Salvia farinacea'' (N) *''Salvia lyrata'' (N) *''Salvia officinalis'' (I) *''Salvia pratensis'' (I) *''Salvia reflexa'' (N) *''Salvia splendens'' (I) *''Salvia × superba'' (I) *''Salvia × sylvestris'' (I) *''Sambucus nigra'' (I) *Sambucus nigra, ''Sambucus nigra'' ssp. ''canadensis'' (N) *Sambucus racemosa, ''Sambucus racemosa'' var. ''racemosa'' (N) *''Samolus valerandi'' (I) *Samolus valerandi, ''Samolus valerandi'' ssp. ''parviflorus'' (N) *''Sanguinaria canadensis'' (N) *''Sanguisorba canadensis'' (N) *Sanguisorba minor, ''Sanguisorba minor'' ssp. ''balearica'' (I) *Sanicula canadensis, ''Sanicula canadensis'' var. ''canadensis'' (N) *Sanicula canadensis, ''Sanicula canadensis'' var. ''grandis'' (N) *''Sanicula marilandica'' (N) *''Sanicula odorata'' (N) *''Sanicula smallii'' (N) *''Sanicula trifoliata'' (N) *''Saponaria officinalis'' (I) *Sarracenia purpurea, ''Sarracenia purpurea'' ssp. ''purpurea'' (N) *''Sassafras albidum'' (N) *''Satureja hortensis'' (I) *''Saururus cernuus'' (N) *''Saxifraga pensylvanica'' (N) *Saxifraga virginiensis, ''Saxifraga virginiensis'' var. ''virginiensis'' (N) *''Scabiosa columbaria'' (I) *''Scandix pecten-veneris'' (I) *''Schedonorus phoenix'' (I) *''Schedonorus pratensis'' (I) *Scheuchzeria palustris, ''Scheuchzeria palustris'' ssp. ''americana'' (N) *''Schizachne purpurascens'' (N) *''Schizachyrium littorale'' (N) *Schizachyrium scoparium, ''Schizachyrium scoparium'' var. ''scoparium'' (N) *Schoenoplectus acutus, ''Schoenoplectus acutus'' var. ''acutus'' (N) *''Schoenoplectus fluviatilis'' (N) *Schoenoplectus pungens, ''Schoenoplectus pungens'' var. ''pungens'' (N) *''Schoenoplectus purshianus'' (N) *''Schoenoplectus saximontanus'' (N) *''Schoenoplectus smithii'' (N) *''Schoenoplectus subterminalis'' (N) *''Schoenoplectus tabernaemontani'' (N) *''Schoenoplectus torreyi'' (N) *''Scilla siberica'' (I) *''Scirpus atrovirens'' (N) *''Scirpus cyperinus'' (N) *''Scirpus expansus'' (N) *''Scirpus georgianus'' (N) *''Scirpus hattorianus'' (N) *''Scirpus pedicellatus'' (N) *''Scirpus pendulus'' (N) *''Scirpus polyphyllus'' (N) *''Scleranthus annuus'' (I) *''Scleria oligantha'' (N) *Scleria pauciflora, ''Scleria pauciflora'' var. ''caroliniana'' (N) *Scleria pauciflora, ''Scleria pauciflora'' var. ''pauciflora'' (N) *''Scleria triglomerata'' (N) *''Scleria verticillata'' (N) *''Sclerochloa dura'' (I) *''Sclerochloa dura'' (N) *''Scrophularia lanceolata'' (N) *''Scrophularia marilandica'' (N) *Scutellaria elliptica, ''Scutellaria elliptica'' var. ''elliptica'' (N) *Scutellaria elliptica, ''Scutellaria elliptica'' var. ''hirsuta'' (N) *''Scutellaria galericulata'' (N) *Scutellaria incana, ''Scutellaria incana'' var. ''incana'' (N) *''Scutellaria integrifolia'' (N) *Scutellaria lateriflora, ''Scutellaria lateriflora'' var. ''lateriflora'' (N) *''Scutellaria nervosa'' (N) *Scutellaria ovata, ''Scutellaria ovata'' ssp. ''ovata'' (N) *Scutellaria parvula, ''Scutellaria parvula'' var. ''missouriensis'' (N) *Scutellaria parvula, ''Scutellaria parvula'' var. ''parvula'' (N) *''Scutellaria saxatilis'' (N) *''Scutellaria serrata'' (N) *''Secale cereale'' (I) *''Securigera varia'' (I) *''Sedum acre'' (I) *''Sedum album'' (I) *''Sedum dendroideum'' (I) *''Sedum pulchellum'' (N) *''Sedum reflexum'' (I) *''Sedum sarmentosum'' (I) *''Sedum sexangulare'' (I) *''Sedum ternatum'' (N) *''Selaginella apoda'' (N) *''Selaginella eclipes'' (N) *''Selaginella rupestris'' (N) *''Senecio sylvaticus'' (I) *''Senecio vulgaris'' (I) *''Senna hebecarpa'' (N) *''Senna marilandica'' (N) *''Sericocarpus asteroides'' (N) *''Sericocarpus linifolius'' (N) *''Sesamum orientale'' (I) *''Setaria faberi'' (I) *''Setaria italica'' (I) *''Setaria parviflora'' (N) *Setaria pumila, ''Setaria pumila'' ssp. ''pumila'' (I) *''Setaria verticillata'' (I) *Setaria viridis, ''Setaria viridis'' var. ''viridis'' (I) *''Shepherdia canadensis'' (N) *''Sherardia arvensis'' (I) *''Sibara virginica'' (N) *''Sicyos angulatus'' (N) *''Sida hermaphrodita'' (N) *''Sida spinosa'' (N) *''Silene antirrhina'' (N) *''Silene armeria'' (I) *Silene caroliniana, ''Silene caroliniana'' ssp. ''pensylvanica'' (N) *Silene caroliniana, ''Silene caroliniana'' ssp. ''wherryi'' (N) *''Silene conica'' (I) *''Silene csereii'' (I) *''Silene dichotoma'' (I) *''Silene dioica'' (I) *Silene latifolia, ''Silene latifolia'' ssp. ''alba'' (I) *''Silene nivea'' (N) *''Silene noctiflora'' (I) *''Silene nutans'' (I) *''Silene regia'' (N) *''Silene rotundifolia'' (N) *''Silene stellata'' (N) *Silene virginica, ''Silene virginica'' var. ''virginica'' (N) *''Silene vulgaris'' (I) *Silphium laciniatum, ''Silphium laciniatum'' var. ''laciniatum'' (N) *Silphium perfoliatum, ''Silphium perfoliatum'' var. ''perfoliatum'' (N) *Silphium terebinthinaceum, ''Silphium terebinthinaceum'' var. ''luciae-brauniae'' (N) *Silphium terebinthinaceum, ''Silphium terebinthinaceum'' var. ''terebinthinaceum'' (N) *Silphium trifoliatum, ''Silphium trifoliatum'' var. ''latifolium'' (N) *Silphium trifoliatum, ''Silphium trifoliatum'' var. ''trifoliatum'' (N) *''Silybum marianum'' (I) *''Sinapis alba'' (I) *Sinapis arvensis, ''Sinapis arvensis'' ssp. ''arvensis'' (I) *''Sisymbrium altissimum'' (I) *''Sisymbrium irio'' (I) *''Sisymbrium loeselii'' (I) *''Sisymbrium officinale'' (I) *''Sisyrinchium albidum'' (N) *''Sisyrinchium angustifolium'' (N) *''Sisyrinchium atlanticum'' (N) *Sisyrinchium montanum, ''Sisyrinchium montanum'' var. ''crebrum'' (N) *''Sisyrinchium mucronatum'' (N) *''Sium suave'' (N) *''Smallanthus uvedalia'' (N) *''Smilax ecirrhata'' (N) *''Smilax glauca'' (N) *''Smilax herbacea'' (N) *''Smilax illinoensis'' (N) *''Smilax lasioneura'' (N) *''Smilax pulverulenta'' (N) *''Smilax rotundifolia'' (N) *''Smilax tamnoides'' (N) *Solanum carolinense, ''Solanum carolinense'' var. ''carolinense'' (N) *Solanum dulcamara, ''Solanum dulcamara'' var. ''dulcamara'' (I) *Solanum lycopersicum, ''Solanum lycopersicum'' var. ''lycopersicum'' (I) *''Solanum physalifolium'' (I) *''Solanum ptychanthum'' (N) *''Solanum rostratum'' (N) *''Solanum triflorum'' (N) *''Solanum tuberosum'' (I) *''Solidago altissima'' (N) *Solidago arguta, ''Solidago arguta'' var. ''arguta'' (N) *''Solidago bicolor'' (N) *''Solidago caesia'' (N) *Solidago canadensis, ''Solidago canadensis'' var. ''canadensis'' (N) *Solidago canadensis, ''Solidago canadensis'' var. ''gilvocanescens'' (N) *Solidago canadensis, ''Solidago canadensis'' var. ''hargeri'' (N) *''Solidago erecta'' (N) *''Solidago flexicaulis'' (N) *''Solidago gigantea'' (N) *Solidago hispida, ''Solidago hispida'' var. ''hispida'' (N) *''Solidago juncea'' (N) *Solidago nemoralis, ''Solidago nemoralis'' var. ''nemoralis'' (N) *Solidago odora, ''Solidago odora'' var. ''odora'' (N) *Solidago patula, ''Solidago patula'' var. ''patula'' (N) *Solidago puberula, ''Solidago puberula'' var. ''puberula'' (N) *Solidago rugosa, ''Solidago rugosa'' ssp. ''aspera'' (N) *Solidago rugosa, ''Solidago rugosa'' ssp. ''rugosa'' var. ''rugosa'' (N) *Solidago rugosa, ''Solidago rugosa'' ssp. ''rugosa'' var. ''villosa'' (N) *Solidago rugosa, ''Solidago rugosa'' ssp. ''rugosa'' (N) *''Solidago rupestris'' (N) *Solidago sempervirens, ''Solidago sempervirens'' var. ''sempervirens'' (N) *Solidago speciosa, ''Solidago speciosa'' var. ''rigidiuscula'' (N) *Solidago speciosa, ''Solidago speciosa'' var. ''speciosa'' (N) *''Solidago sphacelata'' (N) *''Solidago squarrosa'' (N) *Solidago uliginosa, ''Solidago uliginosa'' var. ''linoides'' (N) *Solidago uliginosa, ''Solidago uliginosa'' var. ''uliginosa'' (N) *Solidago ulmifolia, ''Solidago ulmifolia'' var. ''ulmifolia'' (N) *Sonchus arvensis, ''Sonchus arvensis'' ssp. ''arvensis'' (I) *Sonchus arvensis, ''Sonchus arvensis'' ssp. ''uliginosus'' (I) *''Sonchus asper'' (I) *''Sonchus oleraceus'' (I) *''Sorbaria sorbifolia'' (I) *''Sorbus aucuparia'' (I) *''Sorbus decora'' (N) *''Sorghastrum nutans'' (N) *Sorghum bicolor, ''Sorghum bicolor'' ssp. ''bicolor'' (I) *''Sorghum halepense'' (I) *''Sparganium americanum'' (N) *''Sparganium androcladum'' (N) *''Sparganium emersum'' (I) *''Sparganium emersum'' (N) *''Sparganium eurycarpum'' (N) *''Spartina pectinata'' (N) *''Spergula arvensis'' (I) *''Spergularia maritima'' (I) *''Spergularia rubra'' (I) *''Spergularia salina'' (N) *''Spermacoce glabra'' (N) *''Sphenopholis intermedia'' (N) *''Sphenopholis nitida'' (N) *''Sphenopholis obtusata'' (N) *''Sphenopholis × pallens'' (N) *''Sphenopholis pensylvanica'' (N) *''Spinacia oleracea'' (I) *Spiraea alba, ''Spiraea alba'' var. ''alba'' (N) *Spiraea alba, ''Spiraea alba'' var. ''latifolia'' (N) *Spiraea japonica, ''Spiraea japonica'' var. ''fortunei'' (I) *''Spiraea prunifolia'' (I) *''Spiraea tomentosa'' (N) *''Spiraea × vanhouttei'' (I) *''Spiraea virginiana'' (N) *''Spiranthes cernua'' (N) *Spiranthes lacera, ''Spiranthes lacera'' var. ''gracilis'' (N) *Spiranthes lacera, ''Spiranthes lacera'' var. ''lacera'' (N) *''Spiranthes lucida'' (N) *''Spiranthes magnicamporum'' (N) *''Spiranthes ochroleuca'' (N) *Spiranthes ovalis, ''Spiranthes ovalis'' var. ''erostellata'' (N) *''Spiranthes romanzoffiana'' (N) *''Spiranthes tuberosa'' (N) *''Spiranthes vernalis'' (N) *''Spirodela polyrrhiza'' (N) *Sporobolus compositus, ''Sporobolus compositus'' var. ''compositus'' (N) *''Sporobolus cryptandrus'' (N) *''Sporobolus heterolepis'' (N) *''Sporobolus neglectus'' (N) *Sporobolus vaginiflorus, ''Sporobolus vaginiflorus'' var. ''ozarkanus'' (N) *Sporobolus vaginiflorus, ''Sporobolus vaginiflorus'' var. ''vaginiflorus'' (N) *''Stachys aspera'' (N) *''Stachys cordata'' (N) *''Stachys germanica'' (I) *''Stachys palustris'' (N) *Stachys pilosa, ''Stachys pilosa'' var. ''arenicola'' (N) *''Stachys sylvatica'' (I) *''Stachys tenuifolia'' (N) *''Staphylea trifolia'' (N) *''Stellaria alsine'' (N) *''Stellaria corei'' (N) *''Stellaria graminea'' (I) *''Stellaria holostea'' (I) *Stellaria longifolia, ''Stellaria longifolia'' var. ''longifolia'' (N) *Stellaria media, ''Stellaria media'' ssp. ''media'' (I) *Stellaria media, ''Stellaria media'' ssp. ''pallida'' (I) *''Stellaria pubera'' (N) *Stenanthium gramineum, ''Stenanthium gramineum'' var. ''gramineum'' (N) *Stenanthium gramineum, ''Stenanthium gramineum'' var. ''robustum'' (N) *Stenaria nigricans, ''Stenaria nigricans'' var. ''nigricans'' (N) *''Stenosiphon linifolius'' (N) *Streptopus lanceolatus, ''Streptopus lanceolatus'' var. ''lanceolatus'' (N) *Streptopus lanceolatus, ''Streptopus lanceolatus'' var. ''roseus'' (N) *''Strophostyles helvola'' (N) *''Strophostyles leiosperma'' (N) *''Strophostyles umbellata'' (N) *Stuckenia filiformis, ''Stuckenia filiformis'' ssp. ''alpina'' (N) *''Stuckenia pectinata'' (N) *''Stuckenia vaginata'' (N) *''Stylophorum diphyllum'' (N) *''Stylosanthes biflora'' (N) *''Styphnolobium japonicum'' (I) *''Styrax americanus'' (N) *''Styrax grandifolius'' (N) *''Suaeda calceoliformis'' (N) *''Sullivantia sullivantii'' (N) *Symphoricarpos albus, ''Symphoricarpos albus'' var. ''albus'' (N) *Symphoricarpos albus, ''Symphoricarpos albus'' var. ''laevigatus'' (N) *''Symphoricarpos occidentalis'' (N) *''Symphoricarpos orbiculatus'' (N) *''Symphyotrichum boreale'' (N) *''Symphyotrichum ciliatum'' (N) *''Symphyotrichum cordifolium'' (N) *Symphyotrichum drummondii, ''Symphyotrichum drummondii'' var. ''drummondii'' (N) *Symphyotrichum dumosum, ''Symphyotrichum dumosum'' var. ''strictior'' (N) *Symphyotrichum ericoides, ''Symphyotrichum ericoides'' var. ''ericoides'' (N) *Symphyotrichum laeve, ''Symphyotrichum laeve'' var. ''laeve'' (N) *Symphyotrichum lanceolatum, ''Symphyotrichum lanceolatum'' ssp. ''lanceolatum'' var. ''hirsuticaule'' (N) *Symphyotrichum lanceolatum, ''Symphyotrichum lanceolatum'' ssp. ''lanceolatum'' var. ''interior'' (N) *Symphyotrichum lanceolatum, ''Symphyotrichum lanceolatum'' ssp. ''lanceolatum'' var. ''lanceolatum'' (N) *Symphyotrichum lanceolatum, ''Symphyotrichum lanceolatum'' ssp. ''lanceolatum'' var. ''latifolium'' (N) *Symphyotrichum lanceolatum, ''Symphyotrichum lanceolatum'' ssp. ''lanceolatum'' (N) *Symphyotrichum lateriflorum, ''Symphyotrichum lateriflorum'' var. ''lateriflorum'' (N) *''Symphyotrichum lowrieanum'' (N) *''Symphyotrichum novae-angliae'' (N) *''Symphyotrichum oblongifolium'' (N) *''Symphyotrichum ontarionis'' (N) *Symphyotrichum oolentangiense, ''Symphyotrichum oolentangiense'' var. ''oolentangiense'' (N) *Symphyotrichum patens, ''Symphyotrichum patens'' var. ''patens'' (N) *''Symphyotrichum phlogifolium'' (N) *Symphyotrichum pilosum, ''Symphyotrichum pilosum'' var. ''pilosum'' (N) *Symphyotrichum pilosum, ''Symphyotrichum pilosum'' var. ''pringlei'' (N) *Symphyotrichum praealtum, ''Symphyotrichum praealtum'' var. ''praealtum'' (N) *''Symphyotrichum prenanthoides'' (N) *Symphyotrichum puniceum, ''Symphyotrichum puniceum'' var. ''puniceum'' (N) *''Symphyotrichum racemosum'' (N) *''Symphyotrichum sericeum'' (N) *''Symphyotrichum shortii'' (N) *''Symphyotrichum subulatum'' (N) *''Symphyotrichum undulatum'' (N) *''Symphyotrichum urophyllum'' (N) *''Symphytum asperum'' (I) *''Symphytum officinale'' (I) *''Symplocarpus foetidus'' (N) *''Synandra, Synandra hispidula'' (N) *''Syringa vulgaris'' (I)

T

*''Taenidia integerrima'' (N) *''Tagetes erecta'' (I) *''Tagetes patula'' (I) *''Tamarix chinensis'' (I) *''Tanacetum balsamita'' (I) *''Tanacetum coccineum'' (I) *''Tanacetum parthenium'' (I) *''Tanacetum vulgare'' (I) *''Taraxacum laevigatum'' (I) *''Taraxacum officinale'' (N) *Taraxacum officinale, ''Taraxacum officinale'' ssp. ''officinale'' (I) *''Taxodium distichum'' (N) *''Taxus canadensis'' (N) *''Taxus cuspidata'' (I) *''Tephrosia virginiana'' (N) *''Tetradium daniellii'' (I) *''Tetragonia tetragonioides'' (I) *''Tetraneuris herbacea'' (N) *Teucrium canadense, ''Teucrium canadense'' var. ''canadense'' (N) *Teucrium canadense, ''Teucrium canadense'' var. ''occidentale'' (N) *''Thalictrum dasycarpum'' (N) *''Thalictrum dioicum'' (N) *''Thalictrum pubescens'' (N) *''Thalictrum revolutum'' (N) *''Thalictrum thalictroides'' (N) *''Thaspium barbinode'' (N) *Thaspium trifoliatum, ''Thaspium trifoliatum'' var. ''aureum'' (N) *Thaspium trifoliatum, ''Thaspium trifoliatum'' var. ''trifoliatum'' (N) *''Thelypteris noveboracensis'' (N) *Thelypteris palustris, ''Thelypteris palustris'' var. ''pubescens'' (N) *''Thlaspi alliaceum'' (I) *''Thlaspi arvense'' (I) *''Thuja occidentalis'' (N) *''Thymelaea passerina'' (I) *''Thymelaea passerina'' (N) *Thymus praecox, ''Thymus praecox'' ssp. ''arcticus'' (I) *Tiarella cordifolia, ''Tiarella cordifolia'' var. ''cordifolia'' (N) *Tilia americana, ''Tilia americana'' var. ''americana'' (N) *Tilia americana, ''Tilia americana'' var. ''heterophylla'' (N) *''Tilia × europaea'' (I) *''Tipularia discolor'' (N) *Torilis arvensis, ''Torilis arvensis'' ssp. ''arvensis'' (N) *Torilis arvensis, ''Torilis arvensis'' ssp. ''arvensis'' (I) *''Torilis japonica'' (I) *Torreyochloa pallida, ''Torreyochloa pallida'' var. ''pallida'' (N) *Toxicodendron radicans, ''Toxicodendron radicans'' ssp. ''negundo'' (N) *''Toxicodendron rydbergii'' (N) *''Toxicodendron vernix'' (N) *''Tradescantia ohiensis'' (N) *Tradescantia subaspera, ''Tradescantia subaspera'' var. ''subaspera'' (N) *''Tradescantia virginiana'' (N) *''Tragopogon dubius'' (I) *''Tragopogon lamottei'' (I) *''Tragopogon porrifolius'' (I) *''Triadenum fraseri'' (N) *''Triadenum tubulosum'' (N) *''Triadenum virginicum'' (N) *''Triadenum walteri'' (N) *''Triantha glutinosa'' (N) *''Tribulus terrestris'' (I) *''Trichomanes boschianum'' (N) *''Trichomanes intricatum'' (N) *''Trichophorum planifolium'' (N) *''Trichostema brachiatum'' (N) *''Trichostema dichotomum'' (N) *''Trichostema setaceum'' (N) *Tridens flavus, ''Tridens flavus'' var. ''flavus'' (N) *Trientalis borealis, ''Trientalis borealis'' ssp. ''borealis'' (N) *''Trifolium ambiguum'' (I) *''Trifolium arvense'' (I) *''Trifolium aureum'' (I) *''Trifolium campestre'' (I) *''Trifolium dubium'' (I) *''Trifolium hybridum'' (I) *''Trifolium incarnatum'' (I) *''Trifolium pratense'' (I) *''Trifolium reflexum'' (N) *''Trifolium repens'' (I) *''Trifolium resupinatum'' (I) *''Trifolium stoloniferum'' (N) *''Triglochin maritima'' (N) *''Triglochin palustris'' (N) *''Trillium cernuum'' (N) *''Trillium erectum'' (N) *''Trillium flexipes'' (N) *''Trillium grandiflorum'' (N) *''Trillium nivale'' (N) *''Trillium recurvatum'' (N) *''Trillium sessile'' (N) *''Trillium undulatum'' (N) *''Triodanis perfoliata'' (N) *''Triosteum angustifolium'' (N) *Triosteum aurantiacum, ''Triosteum aurantiacum'' var. ''aurantiacum'' (N) *Triosteum aurantiacum, ''Triosteum aurantiacum'' var. ''glaucescens'' (N) *Triosteum aurantiacum, ''Triosteum aurantiacum'' var. ''illinoense'' (N) *''Triosteum perfoliatum'' (N) *''Triphora trianthophora'' (N) *''Triplasis purpurea'' (N) *''Tripleurospermum maritimum'' (N) *Tripleurospermum maritimum, ''Tripleurospermum maritimum'' ssp. ''maritimum'' (I) *''Tripsacum dactyloides'' (N) *''Triticum aestivum'' (I) *Trollius laxus, ''Trollius laxus'' ssp. ''laxus'' (N) *''Tsuga canadensis'' (N) *''Tulipa gesneriana'' (I) *''Tussilago farfara'' (I) *''Typha angustifolia'' (I) *''Typha angustifolia'' (N) *''Typha × glauca'' (N) *''Typha latifolia'' (N)

U

*''Ulmus americana'' (N) *''Ulmus procera'' (I) *''Ulmus pumila'' (I) *''Ulmus rubra'' (N) *''Ulmus thomasii'' (N) *''Urtica chamaedryoides'' (N) *Urtica dioica, ''Urtica dioica'' ssp. ''gracilis'' (N) *Urtica dioica, ''Urtica dioica'' ssp. ''dioica'' (I) *''Utricularia cornuta'' (N) *''Utricularia geminiscapa'' (N) *''Utricularia gibba'' (N) *''Utricularia intermedia'' (N) *''Utricularia macrorhiza'' (N) *''Utricularia minor'' (N) *''Uvularia grandiflora'' (N) *''Uvularia perfoliata'' (N) *''Uvularia sessilifolia'' (N)

V

*''Vaccaria hispanica'' (I) *''Vaccinium angustifolium'' (N) *''Vaccinium corymbosum'' (N) *''Vaccinium fuscatum'' (N) *''Vaccinium macrocarpon'' (N) *''Vaccinium myrtilloides'' (N) *''Vaccinium oxycoccos'' (N) *''Vaccinium pallidum'' (N) *''Vaccinium simulatum'' (N) *''Vaccinium stamineum'' (N) *Valeriana edulis, ''Valeriana edulis'' var. ''ciliata'' (N) *''Valeriana officinalis'' (I) *''Valeriana pauciflora'' (N) *''Valeriana uliginosa'' (N) *''Valerianella chenopodiifolia'' (N) *''Valerianella locusta'' (I) *''Valerianella radiata'' (N) *''Valerianella umbilicata'' (N) *''Vallisneria americana'' (N) *''Veratrum virginicum'' (N) *''Veratrum viride'' (N) *''Veratrum woodii'' (N) *''Verbascum blattaria'' (I) *''Verbascum phlomoides'' (I) *''Verbascum phoeniceum'' (I) *''Verbascum thapsus'' (I) *''Verbascum virgatum'' (I) *''Verbena bracteata'' (N) *''Verbena × engelmannii'' (N) *Verbena hastata, ''Verbena hastata'' var. ''hastata'' (N) *''Verbena × moechina'' (N) *''Verbena simplex'' (N) *''Verbena stricta'' (N) *Verbena urticifolia, ''Verbena urticifolia'' var. ''leiocarpa'' (N) *Verbena urticifolia, ''Verbena urticifolia'' var. ''urticifolia'' (N) *''Verbesina alternifolia'' (N) *''Verbesina helianthoides'' (N) *''Verbesina occidentalis'' (N) *Verbesina virginica, ''Verbesina virginica'' var. ''virginica'' (N) *''Vernonia arkansana'' (N) *Vernonia fasciculata, ''Vernonia fasciculata'' ssp. ''fasciculata'' (N) *Vernonia gigantea, ''Vernonia gigantea'' ssp. ''gigantea'' (N) *''Vernonia × illinoensis'' (N) *''Vernonia missurica'' (N) *''Vernonia noveboracensis'' (N) *''Veronica agrestis'' (I) *''Veronica americana'' (N) *''Veronica anagallis-aquatica'' (N) *''Veronica arvensis'' (I) *Veronica austriaca, ''Veronica austriaca'' ssp. ''teucrium'' (I) *''Veronica beccabunga'' (I) *''Veronica chamaedrys'' (I) *''Veronica filiformis'' (I) *''Veronica hederifolia'' (I) *Veronica officinalis, ''Veronica officinalis'' var. ''officinalis'' (I) *Veronica peregrina, ''Veronica peregrina'' ssp. ''peregrina'' (N) *Veronica peregrina, ''Veronica peregrina'' ssp. ''xalapensis'' (N) *''Veronica persica'' (I) *''Veronica polita'' (I) *''Veronica scutellata'' (N) *''Veronica serpyllifolia'' (N) *Veronica serpyllifolia, ''Veronica serpyllifolia'' ssp. ''serpyllifolia'' (I) *''Veronica verna'' (I) *''Veronicastrum virginicum'' (N) *''Viburnum acerifolium'' (N) *''Viburnum buddleifolium'' (I) *Viburnum dentatum, ''Viburnum dentatum'' var. ''dentatum'' (N) *Viburnum dentatum, ''Viburnum dentatum'' var. ''venosum'' (N) *''Viburnum lantana'' (I) *''Viburnum lantanoides'' (N) *''Viburnum lentago'' (N) *''Viburnum molle'' (N) *Viburnum nudum, ''Viburnum nudum'' var. ''cassinoides'' (N) *Viburnum opulus, ''Viburnum opulus'' var. ''americanum'' (N) *Viburnum opulus, ''Viburnum opulus'' var. ''opulus'' (I) *''Viburnum plicatum'' (I) *''Viburnum prunifolium'' (N) *''Viburnum rafinesqueanum'' (N) *''Viburnum recognitum'' (N) *''Viburnum × rhytidophylloides'' (I) *''Viburnum rufidulum'' (N) *Vicia americana, ''Vicia americana'' ssp. ''americana'' (N) *''Vicia caroliniana'' (N) *Vicia cracca, ''Vicia cracca'' ssp. ''cracca'' (I) *''Vicia hirsuta'' (I) *Vicia sativa, ''Vicia sativa'' ssp. ''nigra'' (I) *Vicia sativa, ''Vicia sativa'' ssp. ''sativa'' (I) *''Vicia tetrasperma'' (I) *Vicia villosa, ''Vicia villosa'' ssp. ''varia'' (I) *Vicia villosa, ''Vicia villosa'' ssp. ''villosa'' (I) *''Vigna unguiculata'' (I) *''Vinca major'' (I) *''Vinca minor'' (I) *''Viola affinis'' (N) *''Viola arvensis'' (I) *''Viola × bernardii'' (N) *''Viola bicolor'' (N) *''Viola × bissellii'' (N) *Viola blanda, ''Viola blanda'' var. ''blanda'' (N) *Viola blanda, ''Viola blanda'' var. ''palustriformis'' (N) *''Viola × brauniae'' (N) *Viola canadensis, ''Viola canadensis'' var. ''canadensis'' (N) *''Viola × conjugens'' (N) *''Viola × consobrina'' (N) *''Viola × cooperrideri'' (N) *''Viola × cordifolia'' (N) *''Viola cucullata'' (N) *''Viola × eclipes'' (N) *''Viola × filicetorum'' (N) *''Viola hastata'' (N) *''Viola hirsutula'' (N) *''Viola labradorica'' (N) *Viola lanceolata, ''Viola lanceolata'' ssp. ''lanceolata'' (N) *Viola macloskeyi, ''Viola macloskeyi'' ssp. ''pallens'' (N) *''Viola × malteana'' (N) *''Viola missouriensis'' (N) *''Viola nephrophylla'' (N) *''Viola odorata'' (I) *''Viola × palmata'' (N) *''Viola pedata'' (N) *''Viola pedatifida'' (N) *''Viola × populifolia'' (N) *''Viola × primulifolia'' (N) *Viola pubescens, ''Viola pubescens'' var. ''pubescens'' (N) *Viola pubescens, ''Viola pubescens'' var. ''scabriuscula'' (N) *''Viola × ravida'' (N) *''Viola rostrata'' (N) *''Viola rotundifolia'' (N) *Viola sagittata, ''Viola sagittata'' var. ''ovata'' (N) *Viola sagittata, ''Viola sagittata'' var. ''sagittata'' (N) *''Viola selkirkii'' (N) *''Viola × slavinii'' (N) *''Viola sororia'' (N) *''Viola striata'' (N) *''Viola tricolor'' (I) *Viola triloba, ''Viola triloba'' var. ''dilatata'' (N) *Viola triloba, ''Viola triloba'' var. ''triloba'' (N) *''Viola tripartita'' (N) *''Viola walteri'' (N) *''Viola × wittrockiana'' (I) *Vitex negundo, ''Vitex negundo'' var. ''heterophylla'' (I) *Vitis aestivalis, ''Vitis aestivalis'' var. ''aestivalis'' (N) *Vitis aestivalis, ''Vitis aestivalis'' var. ''bicolor'' (N) *Vitis cinerea, ''Vitis cinerea'' var. ''baileyana'' (N) *''Vitis labrusca'' (N) *''Vitis riparia'' (N) *''Vitis vulpina'' (N) *''Vittaria appalachiana'' (N) *''Vulpia bromoides'' (I) *''Vulpia myuros'' (I) *Vulpia octoflora, ''Vulpia octoflora'' var. ''glauca'' (N)

W

*Waldsteinia fragarioides, ''Waldsteinia fragarioides'' ssp. ''fragarioides'' (N) *''Wisteria floribunda'' (I) *''Wisteria frutescens'' (N) *''Wolffia borealis'' (N) *''Wolffia brasiliensis'' (N) *''Wolffia columbiana'' (N) *''Wolffiella gladiata'' (N) *''Woodsia ilvensis'' (N) *Woodsia obtusa, ''Woodsia obtusa'' ssp. ''obtusa'' (N) *''Woodwardia virginica'' (N)

X

*''Xanthium spinosum'' (I) *Xanthium strumarium, ''Xanthium strumarium'' var. ''canadense'' (N) *Xanthium strumarium, ''Xanthium strumarium'' var. ''glabratum'' (N) *''Xanthorhiza simplicissima'' (N) *Xyris difformis, ''Xyris difformis'' var. ''difformis'' (N) *''Xyris torta'' (N)

Y

*''Yucca filamentosa'' (N)

Z

*''Zannichellia palustris'' (N) *''Zanthoxylum americanum'' (N) *Zea mays, ''Zea mays'' ssp. ''mays'' (I) *''Zelkova serrata'' (I) *Zigadenus elegans, ''Zigadenus elegans'' ssp. ''glaucus'' (N) *Zizania aquatica, ''Zizania aquatica'' var. ''aquatica'' (N) *Zizania palustris, ''Zizania palustris'' var. ''interior'' (N) *''Zizia aptera'' (N) *''Zizia aurea'' (N)

References

USDA PLANTS Database

External links

Ohio's top ten invasive plants

Rare Native Ohio Plants 2006-2007

''Flora of North America''
{{Flora of the United States by political division Flora of Ohio, Ohio-related lists, Flora of Ohio Lists of flora of the United States by state, Ohio

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See also

References

External links