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List of Canadian plants by family This is the list of the plants in Canada, ordered by Family (biology), family. This list does not include List of introduced species to North America, introduced species, which form a separate list. {{Dynamic list Families: List of Canadian plan ...
Families: A , B , C , D , E , F , G , H , I J K , L , M , N , O , P Q , R , S , T , U V W , X Y Z


Oedipodiaceae

* '' Oedipodium griffithianum''


Oleaceae Oleaceae, also known as the olive family, is a taxonomic family of flowering shrubs, trees, and a few lianas in the order Lamiales, It presently comprises 28 genera, one of which is recently extinct.Peter S. Green. 2004. "Oleaceae". pages 296-30 ...

* ''
Fraxinus americana ''Fraxinus americana'', the white ash or American ash, is a species of '' ash tree'' native to eastern and central North America. The species is native to mesophytic hardwood forests from Nova Scotia west to Minnesota, south to northern Florida ...
'' — white ash * ''
Fraxinus latifolia ''Fraxinus latifolia'', the Oregon ash, is a member of the ash genus '' Fraxinus'', native to western North America. Description ''Fraxinus latifolia'' is a medium-sized deciduous tree that can grow to heights of in height, with a trunk diame ...
'' — Oregon ash * ''
Fraxinus nigra ''Fraxinus nigra'', the black ash, is a species of ash native to much of eastern Canada and the northeastern United States, from western Newfoundland west to southeastern Manitoba, and south to Illinois and northern Virginia. Formerly abundant, a ...
'' — black ash * ''
Fraxinus pennsylvanica ''Fraxinus pennsylvanica'', the green ash or red ash, is a species of ash native to eastern and central North America, from Nova Scotia west to southeastern Alberta and eastern Colorado, south to northern Florida, and southwest to Oklahoma an ...
'' — green ash * '' Fraxinus profunda'' — pumpkin ash * ''
Fraxinus quadrangulata ''Fraxinus quadrangulata'', the blue ash, is a species of ash native primarily to the Midwestern United States from Oklahoma to Michigan, as well as the Bluegrass region of Kentucky and the Nashville Basin region of Tennessee. Isolated populati ...
'' — blue ash


Onagraceae The Onagraceae are a family of flowering plants known as the willowherb family or evening primrose family. They include about 650 species of herbs, shrubs, and treesBoisduvalia densiflora'' — denseflower spike-primrose * '' Boisduvalia glabella'' — smooth spike-primrose * ''
Calylophus serrulatus ''Calylophus serrulatus'' is a species of flowering plant in the Onagraceae known by the common name yellow sundrops. Other common names include halfshrub sundrop,
'' — yellow evening-primrose * '' Camissonia andina'' — Blackfoot River suncup * '' Camissonia breviflora'' — shortflower suncup * '' Camissonia contorta'' — dwarf contorted suncup * '' Circaea alpina'' — small enchanter's-nightshade * ''
Circaea lutetiana ''Circaea lutetiana'', known as broad-leaved enchanter's nightshade, is a plant in the evening primrose family, Onagraceae. The genus name comes from the enchantress Circe of Greek mythology and the specific designation is derived from Lutetia, ...
'' — southern broadleaf enchanter's-nightshade * '' Circaea x intermedia'' — intermediate enchanger's-nightshade * ''
Clarkia amoena ''Clarkia amoena'' (farewell to spring or godetia; syn. ''Godetia amoena'') is a flowering plant native to western North America, found in coastal hills and mountains from British Columbia south to the San Francisco Bay Area. It is an annual ...
'' — farewell-to-spring * '' Clarkia pulchella'' — largeflower clarkia * '' Clarkia purpurea'' — winecup clarkia * '' Clarkia rhomboidea'' — tongue clarkia * '' Epilobium anagallidifolium'' — alpine willowherb * ''
Epilobium angustifolium ''Chamaenerion angustifolium'' is a perennial herbaceous flowering plant in the willowherb family Onagraceae. It is known in North America as fireweed, in some parts of Canada as great willowherb, in Britain and Ireland as rosebay willowherb. I ...
'' — fireweed * ''
Epilobium arcticum ''Epilobium'' is a genus of flowering plants in the family Onagraceae, containing about 197 species. The genus has a worldwide distribution. It is most prevalent in the subarctic, temperate and subantarctic regions, whereas in the subtropics an ...
'' — arctic willowherb * '' Epilobium brachycarpum'' — panicled willowherb * ''
Epilobium ciliatum ''Epilobium ciliatum'', known by the common names fringed willowherb, American willowherb, slender willow herb, and northern willow herb is a species of ''flowering plant'' in the willowherb family Onagraceae. This species is native to much of No ...
'' — hairy willowherb * '' Epilobium clavatum'' — clavate-fruit willowherb * '' Epilobium coloratum'' — purpleleaf willowherb * '' Epilobium davuricum'' — Dahuria willowherb * '' Epilobium foliosum'' — California willowherb * '' Epilobium glaberrimum'' — glaucous willowherb * '' Epilobium halleanum'' — glandular willowherb * '' Epilobium hornemannii'' — Hornemann's willowherb * '' Epilobium lactiflorum'' — whiteflower willowherb * ''
Epilobium latifolium ''Chamaenerion latifolium'' (formerly ''Epilobium latifolium'', also called ''Chamerion latifolium'') is a species of flowering plant in the evening primrose family known by the English common names dwarf fireweed and river beauty willowherb. It ...
'' — river beauty * '' Epilobium leptocarpum'' — slender-fruited willowherb * '' Epilobium leptophyllum'' — linear-leaved willowherb * '' Epilobium luteum'' — yellow willowherb * '' Epilobium minutum'' — smallflower willowherb * '' Epilobium mirabile'' — Olimple Mountain willowherb * '' Epilobium oregonense'' — Oregon willowherb * ''
Epilobium palustre ''Epilobium palustre'' is a species of willowherb known by the common name marsh willowherb. This plant has a circumboreal distribution, and can be found farther south in mountainous areas. Description This is a hairy perennial growing spindly s ...
'' — marsh willowherb * '' Epilobium saximontanum'' — Rocky Mountain willowherb * '' Epilobium strictum'' — downy willowherb * '' Epilobium x wisconsinense'' * '' Gaura biennis'' — biennial gaura * '' Gaura coccinea'' — scarlet gaura * '' Gayophytum diffusum'' — diffuse groundsmoke * '' Gayophytum humile'' — low groundsmoke * '' Gayophytum racemosum'' — racemed groundsmoke * '' Gayophytum ramosissimum'' — much-branch groundsmoke * '' Ludwigia alternifolia'' — bushy seedbox * ''
Ludwigia palustris ''Ludwigia palustris'' is a species of flowering plant in the evening primrose family known by the common names marsh seedbox, Hampshire-purslane and water purslane. This is an aquatic or semiaquatic perennial herb which grows in moist to wet ...
'' — marsh seedbox * '' Ludwigia polycarpa'' — many-fruit false-loosestrife * ''
Oenothera biennis ''Oenothera biennis'', the common evening-primrose, is a species of flowering plant in the family Onagraceae, native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely ...
'' — common evening-primrose * ''
Oenothera caespitosa ''Oenothera caespitosa'', known commonly as tufted evening primrose, desert evening primrose, rock-rose evening primrose, or fragrant evening primrose, is a perennial plant of the genus ''Oenothera'' native to much of western and central North A ...
'' — tufted evening-primrose * ''
Oenothera clelandii ''Oenothera'' is a genus of about 145 species of herbaceous flowering plants native to the Americas. It is the type genus of the family Onagraceae. Common names include evening primrose, suncups, and sundrops. They are not closely related to ...
'' — lesser four-point evening-primrose * ''
Oenothera elata ''Oenothera elata'' is a species of ''Oenothera'' known by the common name Hooker's evening primrose or tall evening primrose. Subspecies include ''hookeri'', ''hirsutissima'', ''longisima'', ''jamesii'', ''villosa'' and ''elata''. It is native t ...
'' — Hooker's evening-primrose * ''
Oenothera flava ''Oenothera'' is a genus of about 145 species of herbaceous flowering plants native to the Americas. It is the type genus of the family Onagraceae. Common names include evening primrose, suncups, and sundrops. They are not closely related to ...
'' — long-tubed evening-primrose * ''
Oenothera fruticosa ''Oenothera fruticosa'', the narrowleaf evening primroseOenothera fruticosa L.
USDA PLANTS
'' — narrowleaf sundrops * '' Oenothera nuttallii'' — white-stemmed evening-primrose * '' Oenothera oakesiana'' — Oakes' evening-primrose * '' Oenothera pallida'' — pale evening-primrose * '' Oenothera parviflora'' — northern evening-primrose * '' Oenothera perennis'' — small sundrops * '' Oenothera pilosella'' — meadow evening-primrose * '' Oenothera villosa'' — hairy evening-primrose


Ophioglossaceae

* ''
Botrychium acuminatum ''Botrychium'' is a genus of ferns, seedless vascular plants in the family Ophioglossaceae. ''Botrychium'' species are known as moonworts. They are small, with fleshy roots, and reproduce by spores shed into the air. One part of the leaf, the ...
'' — moonwort * '' Botrychium ascendens'' — upward-lobed moonwort * '' Botrychium boreale'' — northern moonwort * '' Botrychium campestre'' — prairie dunewort * '' Botrychium crenulatum'' — crenulate moonwort * '' Botrychium dissectum'' — cutleaf grapefern * ''
Botrychium hesperium ''Botrychium'' is a genus of ferns, seedless vascular plants in the family Ophioglossaceae. ''Botrychium'' species are known as moonworts. They are small, with fleshy roots, and reproduce by spores shed into the air. One part of the leaf, the ...
'' — western moonwort * ''
Botrychium lanceolatum ''Botrychium lanceolatum'' is a species of plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fung ...
'' — triangle grapefern * '' Botrychium lineare'' — narrowleaf grapefern * ''
Botrychium lunaria ''Botrychium lunaria'' is a species of fern in the family Ophioglossaceae known by the common name moonwort or common moonwort. It is the most widely distributed moonwort, growing throughout the Northern Hemisphere across Eurasia and from Alaska ...
'' — moonwort grapefern * '' Botrychium matricariifolium'' — chamomile grapefern * '' Botrychium minganense'' — Mingan's moonwort * '' Botrychium montanum'' — mountain moonwort * '' Botrychium mormo'' — little goblin moonwort * '' Botrychium multifidum'' — leathery grapefern * '' Botrychium oneidense'' — bluntlobe grapefern * '' Botrychium pallidum'' — pale moonwort * '' Botrychium paradoxum'' — peculiar moonwort * '' Botrychium pedunculosum'' — stalked moonwort * '' Botrychium pinnatum'' — northern moonwort * ''
Botrychium pseudopinnatum ''Botrychium'' is a genus of ferns, seedless vascular plants in the family Ophioglossaceae. ''Botrychium'' species are known as moonworts. They are small, with fleshy roots, and reproduce by spores shed into the air. One part of the leaf, the ...
'' — false daisyleaf grapefern * '' Botrychium rugulosum'' — rugulose grapefern * '' Botrychium simplex'' — least grapefern * '' Botrychium spathulatum'' — spoonleaf moonwort * ''
Botrychium tunux ''Botrychium'' is a genus of ferns, seedless vascular plants in the family Ophioglossaceae. ''Botrychium'' species are known as moonworts. They are small, with fleshy roots, and reproduce by spores shed into the air. One part of the leaf, the ...
'' * '' Botrychium virginianum'' — rattlesnake fern * '' Botrychium x watertonense'' * ''
Botrychium yaaxudakeit ''Botrychium'' is a genus of ferns, seedless vascular plants in the family Ophioglossaceae. ''Botrychium'' species are known as moonworts. They are small, with fleshy roots, and reproduce by spores shed into the air. One part of the leaf, the ...
'' * ''
Ophioglossum pusillum ''Ophioglossum pusillum'' is a species of fern in the family Ophioglossaceae known by the common name northern adder's tongue. It is native to northern North America, where it is widespread in moist areas such as marshes, fens, and meadows. It ...
'' — northern adder's-tongue * ''
Ophioglossum vulgatum ''Ophioglossum vulgatum'', commonly known as adder's-tongue, southern adders-tongue or adders-tongue fern, is a species of fern in the family '' Ophioglossaceae''. The adder’s tongue fern is generally believed to have the largest number of chr ...
'' — southern adder's-tongue


Orchidaceae Orchids are plants that belong to the family Orchidaceae (), a diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Along with the Asteraceae, they are one of the two largest families of flowering ...

* '' Amerorchis rotundifolia'' — round-leaved orchis * '' Aplectrum hyemale'' — puttyroot * ''
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 ...
'' — dragon's mouth * ''
Calopogon tuberosus ''Calopogon tuberosus'', the tuberous grass pink, is an orchid native to eastern North America. Distribution In the United States, it occurs from as far southwest as Texas and Oklahoma and southeast to the Florida Everglades to as far northeast ...
'' — tuberous grass-pink * ''
Calypso bulbosa ''Calypso'' is a genus of orchids containing one species, ''Calypso bulbosa'', known as the calypso orchid, fairy slipper or Venus's slipper. It is a perennial member of the orchid family found in undisturbed northern and montane forests. It h ...
'' — fairy slipper * ''
Cephalanthera austiniae ''Cephalanthera austiniae'' is a species of orchid known as the phantom orchid and snow orchid because the entire plant is white except for a few yellow markings on the flowers. The orchid is native to the western United States (California, Oreg ...
'' — phantom orchid * ''
Coeloglossum viride ''Coeloglossum'' is a genus of flowering plants in the orchid family Orchidaceae. It has long been considered to have only one species, ''Coeloglossum viride'', the frog orchid. Some recent classifications regard ''Coeloglossum'' as part of the ...
'' — longbract green orchis * '' Corallorhiza maculata'' — spotted coralroot * '' Corallorhiza mertensiana'' — Merten's coralroot * '' Corallorhiza odontorhiza'' — autumn coralroot * '' Corallorhiza striata'' — striped coralroot * ''
Corallorhiza trifida ''Corallorhiza trifida'', commonly known as early coralroot, northern coralroot, or yellow coralroot, is a coralroot orchid native to North America and Eurasia, with a circumboreal distribution. The species has been reported from the United Sta ...
'' — early coralroot * ''
Cypripedium acaule ''Cypripedium acaule'' is a species of flowering plant in the orchid family Orchidaceae. It is commonly referred to as the pink lady's slipper or moccasin flower. The specific epithet ''acaule'' means "lacking an obvious stem", a reference to it ...
'' — pink lady's-slipper * ''
Cypripedium arietinum ''Cypripedium arietinum'', the ram's head lady's slipper, is a rare orchid that grows in lightly shaded areas with calcareous Calcareous () is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing ...
'' — ram's-head lady's-slipper * ''
Cypripedium candidum ''Cypripedium candidum'', known as the small white lady's slipper or white lady's slipper, is a rare orchid of the genus ''Cypripedium''. It is native to eastern North America across the northern United States and southern Canada. Distribution ' ...
'' — small white lady's-slipper * '' Cypripedium guttatum'' — spotted lady's-slipper * '' Cypripedium montanum'' — mountain lady's-slipper * ''
Cypripedium parviflorum ''Cypripedium parviflorum'', commonly known as yellow lady's slipper or moccasin flower, is a lady's slipper orchid native to North America. It is widespread, ranging from Alaska south to Arizona and Georgia. It grows in fens, wetlands, shoreline ...
'' — American yellow lady's-slipper * ''
Cypripedium passerinum ''Cypripedium passerinum'' is a species of lady's slipper orchid known by the common names sparrow's-egg lady's-slipper, spotted lady's-slipper, and Franklin's lady's-slipper. Description This orchid is a rhizomatous monocot, perennial herb ...
'' — sparrow's-egg lady's-slipper * ''
Cypripedium reginae ''Cypripedium reginae'', known as the showy lady's slipper, pink-and-white lady's-slipper, or the queen's lady's-slipper, is a rare lady's-slipper orchid native to northern North America. Although never common, this plant has vanished from much o ...
'' — showy lady's-slipper * '' Cypripedium x andrewsii'' — Andrews' lady's-slipper * '' Cypripedium x columbianum'' — Columbian lady's-slipper * '' Cypripedium x favillianum'' * '' Cypripedium x landonii'' — Landon's lady's-slipper * ''
Dactylorhiza praetermissa ''Dactylorhiza praetermissa'', the southern marsh orchid or leopard marsh orchid, is a commonly occurring species of European orchid. Description ''Dactylorhiza praetermissa'' grows to tall, with leaves generally unspotted. The flowers, appea ...
'' — southern marsh orchid * ''
Epipactis gigantea ''Epipactis gigantea'' is a species of orchid known as the stream orchid, giant helleborine, and chatterbox. This wildflower is native to western North America from British Columbia to central Mexico. This is one of the most abundant orchids of ...
'' — giant helleborine * ''
Galearis spectabilis ''Galearis spectabilis'', commonly known as showy orchis or showy orchid, is an orchid species of the genus '' Galearis''. It is native to eastern Canada (Quebec, Ontario and New Brunswick) and much of the eastern half of the United States (from ...
'' — showy orchis * '' Goodyera oblongifolia'' — giant rattlesnake-plantain * ''
Goodyera pubescens ''Goodyera pubescens'', the downy rattlesnake plantain, (also known as ''Peramium pubescens'' ) is one of the most common orchids native to eastern North America. It is found from Florida to Nova Scotia, west to eastern Oklahoma, Minnesota and On ...
'' — downy rattlesnake-plantain * ''
Goodyera repens ''Goodyera repens'', an orchid in the genus ''Goodyera'', is called by the common name creeping lady's-tresses in Anglophone Europe and dwarf rattlesnake plantain or lesser rattlesnake plantain in North America. It is a green underground creeper ...
'' — dwarf rattlesnake-plantain * ''
Goodyera tesselata ''Goodyera tesselata'' is a plant in the orchid family (Orchidaceae), called by the common name checkered rattlesnake plantain. It is native to eastern Canada from Manitoba to Newfoundland, and to the northeastern United States from Maine to Mar ...
'' — checkered rattlesnake-plantain * '' Isotria medeoloides'' — small whorled pogonia * '' Isotria verticillata'' — large whorled pogonia * '' Liparis liliifolia'' — large twayblade * ''
Liparis loeselii ''Liparis loeselii'', the fen orchid, yellow widelip orchid, or bog twayblade, is a species of orchid. It is native to Europe, northern Asia, the eastern United States, and eastern Canada. It grows in fen A fen is a type of peat-accumulatin ...
'' — Lösel's twayblade * '' Malaxis brachypoda'' — white adder's-mouth * '' Malaxis diphyllos'' — Aleutian adder's-mouth * '' Malaxis paludosa'' — bog adder's-mouth * '' Malaxis unifolia'' — green adder's-mouth * ''
Neottia auriculata ''Neottia auriculata'' (syn. ''Listera auriculata''), the auricled twayblade, (as ''Listera auriculata'') is a species of terrestrial orchid found in northeastern North America (Labrador, New Brunswick and Maine west to Manitoba and Minnesota. ...
'' — auricled twayblade * '' Neottia australis'' — southern twayblade * '' Neottia borealis'' — northern twayblade * '' Neottia caurina'' — western twayblade * '' Neottia convallarioides'' — broad-leaved twayblade * ''
Neottia cordata ''Neottia cordata'', the lesser twayblade or heartleaf twayblade, is an orchid of upland bogs and mires that rarely exceeds in height. It was formerly placed in the genus '' Listera'', but molecular phylogenetic studies have shown that ''Neot ...
'' — heartleaf twayblade * '' Neottia x veltmanii'' — Veltman's twayblade * '' Piperia candida'' — white piperia * '' Piperia elegans'' — hillside rein orchid * '' Piperia elongata'' — denseflower rein orchid * '' Piperia transversa'' — royal rein orchid * '' Piperia unalascensis'' — Alaska rein orchid * '' Platanthera albida'' — vanilla-scent bog orchid * ''
Platanthera aquilonis ''Platanthera aquilonis'', the northern green orchid or north wind bog orchid, is a species of orchid native to the United States and Canada. It is closely related to '' Platanthera huronensis'' and ''Platanthera dilatata ''Platanthera dilata ...
'' * ''
Platanthera blephariglottis ''Platanthera blephariglottis'', commonly known as the white fringed orchid or white-fringed orchis, is a species of orchid of the genus '' Platanthera''. It is considered to be an endangered species in Connecticut and Ohio, a threatened specie ...
'' — white-fringe orchis * '' Platanthera chorisiana'' — Choriso bog orchid * ''
Platanthera clavellata ''Platanthera clavellata'', commonly known as the club-spur orchid or small green wood orchid, is a terrestrial orchid of North America. Description ''Platanthera clavellata'' plants are 4-16" tall. It is one of the smallest species out of the ...
'' — small green woodland orchid * ''
Platanthera dilatata ''Platanthera dilatata'', known as tall white bog orchid, bog candle, or boreal bog orchid is a species of orchid, a flowering plant in the family Orchidaceae, native to North America. It was first formally described in 1813 by Frederick Traugot ...
'' — leafy white orchis * ''
Platanthera flava ''Platanthera flava'', the palegreen orchid, is a species of pale-flowered orchid. It is native to eastern North America, from Texas east to Florida, north to Ontario, Quebec and Nova Scotia. ''Platanthera flava'' has from 10 to 40 flowers in ...
'' — southern rein orchid * '' Platanthera grandiflora'' — large purple-fringe orchis * ''
Platanthera hookeri Platanthera hookeri, otherwise known as Hooker's orchid or Hooker's bog orchid, is a perennial wildflower in the genus '' Platanthera'' that can be found in temperate regions of North America ranging from Iowa to Newfoundland Newfoundland a ...
'' — Hooker's orchis * ''
Platanthera hyperborea ''Platanthera hyperborea'', the northern green orchid, is small orchid found only in Greenland, Iceland, and Akimiski Island in Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atl ...
'' — leafy northern green orchid * '' Platanthera lacera'' — green-fringe orchis * '' Platanthera leucophaea'' — eastern prairie white-fringed orchid * '' Platanthera leucostachys'' — Bog rein orchid, scentbottle * '' Platanthera obtusata'' — small northern bog orchid * '' Platanthera orbiculata'' — large roundleaf orchid * ''
Platanthera praeclara ''Platanthera praeclara'', known as the western prairie fringed orchid and the Great Plains white fringed orchid, is a rare and threatened species of orchid native to North America. Distribution Historically, ''Platanthera praeclara'' was found ...
'' — western prairie white-fringed orchid * ''
Platanthera psycodes ''Platanthera psycodes'', commonly called lesser purple fringed orchid or small purple-fringed orchid, is a species of orchid, genus '' Platanthera'', occurring from eastern Canada (from Manitoba to Newfoundland) to the east-central and northea ...
'' — small purple-fringe orchis * '' Platanthera stricta'' — slender bog orchid * '' Platanthera x andrewsii'' — Andrews' platanthera * '' Platanthera x hollandiae'' — Holland's platanthera * '' Platanthera x keenanii'' — Keenan's platanthera * '' Platanthera x media'' * '' Platanthera x reznicekii'' — Reznicek's platanthera * '' Platanthera x vossii'' — Voss' platanthera * '' Pogonia ophioglossoides'' — rose pogonia * '' Spiranthes casei'' — Case's ladies'-tresses * '' Spiranthes cernua'' — nodding ladies'-tresses * '' Spiranthes lacera'' — southern slender ladies'-tresses * '' Spiranthes lucida'' — shining ladies'-tresses * ''
Spiranthes magnicamporum ''Spiranthes magnicamporum'', commonly called the Great Plains lady's tresses, is a species of orchid that is native to North America. It is primarily native in the Great Plains, but there are outlying populations in the east in areas of former ...
'' — Great Plains ladies'-tresses * '' Spiranthes ochroleuca'' — yellow nodding ladies'-tresses * '' Spiranthes ovalis'' — lesser ladies'-tresses * ''
Spiranthes romanzoffiana ''Spiranthes romanzoffiana'', commonly known as hooded lady's tresses (alternatively hooded ladies' tresses) or Irish lady's-tresses (Irish: Cùilìn Gaelach), is a species of orchid. Collected by Chamisso during the Romanzov expedition it was de ...
'' — hooded ladies'-tresses * '' Spiranthes x intermedia'' * '' Spiranthes x simpsonii'' — Simpson's ladies'-tresses * '' Triphora trianthophora'' — nodding pogonia


Orobanchaceae Orobanchaceae, the broomrapes, is a family of mostly parasitic plants of the order Lamiales, with about 90 genera and more than 2000 species. Many of these genera (e.g., ''Pedicularis'', ''Rhinanthus'', ''Striga'') were formerly included in the ...

* '' Boschniakia hookeri'' — Vancouver groundcone * ''
Boschniakia rossica ''Boschniakia rossica'', commonly known as the northern groundcone, is a holoparasitic plant that lives in the northern latitudes of the northern hemisphere. In the Pacific Northwest Temperate Rainforest, it does not grow south of Prince of Wa ...
'' — northern groundcone * '' Boschniakia strobilacea'' — California groundcone * ''
Conopholis americana ''Conopholis americana'', the American cancer-root, bumeh or bear corn, is a perennial, non-photosynthesizing (or "achlorophyllous") parasitic plant. It is from the family Orobanchaceae and more recently from the genus ''Conopholis'' but also lis ...
'' — American cancer-root * '' Epifagus virginiana'' — beechdrops * '' Orobanche californica'' — California broomrape * '' Orobanche corymbosa'' — flat-top broomrape * '' Orobanche fasciculata'' — clustered broomrape * '' Orobanche ludoviciana'' — Louisiana broomrape * '' Orobanche pinorum'' — pine broomrape * ''
Orobanche uniflora ''Orobanche uniflora'', commonly known as one-flowered broomrape, one-flowered cancer root, ghost pipe or naked broomrape, is an annual parasitic herbaceous plant. It is native to much of North America, where it is a parasitic plant, tapping nutr ...
'' — one-flowered broomrape


Orthotrichaceae Orthotrichaceae is the only family of mosses in the order Orthotrichales. Many species in the family are epiphytic. Classification *'' Cardotiella'' *'' Ceuthotheca'' *'' Codonoblepharon'' *'' Desmotheca'' *'' Florschuetziella'' *'' Groutiella' ...

* '' Amphidium californicum'' * '' Amphidium lapponicum'' * '' Amphidium mougeotii'' * '' Drummondia prorepens'' * '' Orthotrichum affine'' * '' Orthotrichum alpestre'' * '' Orthotrichum anomalum'' * '' Orthotrichum consimile'' * '' Orthotrichum cupulatum'' * '' Orthotrichum gymnostomum'' * ''
Orthotrichum hallii ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum laevigatum'' * ''
Orthotrichum lyellii ''Orthotrichum lyellii'', also known as Lyell's bristle moss, is a species of acrocarpous moss belonging to the family Orthotrichaceae. ''O. lyellii'' can be found throughout western North America and Europe. It is found most commonly growing epi ...
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Orthotrichum obtusifolium ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum ohioense ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pallens ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pellucidum ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pulchellum ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pumilum ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pusillum ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum pylaisii ''Orthotrichum'' is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include:Orthotrichum rivulare'' * '' Orthotrichum rupestre'' * '' Orthotrichum sordidum'' * '' Orthotrichum speciosum'' * '' Orthotrichum stellatum'' * '' Orthotrichum stramineum'' * '' Orthotrichum strangulatum'' * ''
Orthotrichum striatum ''Orthotrichum striatum'' is a species of moss belonging to the family Orthotrichaceae. It has cosmopolitan distribution. References

{{Taxonbar, from=Q31272 Orthotrichales ...
'' * '' Orthotrichum tenellum'' * '' Ulota coarctata'' * '' Ulota crispa'' * '' Ulota curvifolia'' * '' Ulota drummondii'' * '' Ulota hutchinsiae'' * '' Ulota megalospora'' * '' Ulota obtusiuscula'' * '' Ulota phyllantha'' * ''
Zygodon conoideus ''Zygodon'' is a genus of moss in family Orthotrichaceae Orthotrichaceae is the only family of mosses in the order Orthotrichales. Many species in the family are epiphytic. Classification *'' Cardotiella'' *'' Ceuthotheca'' *'' Codonoblepha ...
'' * '' Zygodon gracilis'' * '' Zygodon reinwardtii'' * '' Zygodon viridissimus''


Osmundaceae Osmundaceae (royal fern family) is a family of ferns containing four to six extant genera and 18–25 known species. It is the only living family of the order Osmundales in the class Polypodiopsida (ferns) or in some classifications the only ord ...

* ''
Osmunda claytoniana ''Claytosmunda'' is a genus of fern. It has only one extant species, ''Claytosmunda claytoniana'' ( synonym ''Osmunda claytoniana''), the interrupted fern, native to Eastern Asia, Eastern United States, and Eastern Canada. The specific epithet ...
'' — interrupted fern * ''
Osmunda spectabilis ''Osmunda spectabilis'', known as American royal fern, is a species of fern native to a large area of the New World, from the eastern half of Canada and the United States to Argentina. Description ''Osmunda spectabilis'' is an easy fern to recog ...
'' — royal fern * ''
Osmundastrum cinnamomeum ''Osmundastrum'' is genus of leptosporangiate ferns in the family Osmundaceae with one living species, ''Osmundastrum cinnamomeum'', the cinnamon fern. It is native to the Americas and eastern Asia, growing in swamps, bogs and moist woodlands. I ...
'' — cinnamon fern


Oxalidaceae The Oxalidaceae, or wood sorrel family, are a small family of five genera of herbaceous plants, shrubs and small trees, with the great majority of the 570 species in the genus ''Oxalis'' (wood sorrels). Members of this family typically have divid ...

* '' Oxalis dillenii'' — Dillen's woodsorrel * ''
Oxalis montana ''Oxalis montana'' is a species of flowering plant in the family Oxalidaceae known by the common names mountain woodsorrel, wood shamrock, sours and white woodsorrel. It may also be called common woodsorrel, though this name also applies to its ...
'' — white woodsorrel * '' Oxalis oregana'' — Oregon woodsorrel * ''
Oxalis stricta ''Oxalis stricta'', called the common yellow woodsorrel (or simply yellow woodsorrel), common yellow oxalis, upright yellow-sorrel, lemon clover, or more ambiguously and informally "sourgrass", "sheep weed", or "pickle plant", is a herbaceous pla ...
'' — common yellow woodsorrel * ''
Oxalis suksdorfii ''Oxalis suksdorfii'' is a species of flowering plant in the woodsorrel family known by the common name western yellow woodsorrel and Suksdorf's woodsorrel. It is native to the western coast of the United States from Washington to northern Calif ...
'' — western yellow oxalis {{div col end *