''Tsuga caroliniana'', the Carolina hemlock, is a species of hemlock

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the United States.

Distribution and habitat

Carolina hemlock is native to the

Appalachian Mountains The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. They ...

in southwest

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...

, western

North Carolina North Carolina () is a state in the Southeastern region of the United States. The state is the 28th largest and 9th-most populous of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, Georgia and So ...

, extreme northeast

Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...

, northwest

South Carolina )''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...

, and eastern

Tennessee Tennessee ( , ), officially the State of Tennessee, is a landlocked state in the Southeastern region of the United States. Tennessee is the 36th-largest by area and the 15th-most populous of the 50 states. It is bordered by Kentucky to th ...

.Geographic Distribution Map
''Tsuga caroliniana (Carolina Hemlock)''
Its habitat is on rocky mountain slopes at elevations of . The optimal growing condition is a partly shady area with moist but well-drained soil in a cool climate. There is a small, self-sustaining population of Carolina hemlock in the Virginia Kendall State Park Historic District of the

Cuyahoga Valley National Park Cuyahoga Valley National Park is an American national park that preserves and reclaims the rural landscape along the Cuyahoga River between Akron and Cleveland in Northeast Ohio. The park is administered by the National Park Service, but within ...

in northeast

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 ...

planted originally as part of reforestation efforts during the park’s development in the 1930s and 40s.

Description

It is an

evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, which ...

coniferous Conifers are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All extant ...

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are ...

growing up to (exceptionally ) tall and in trunk diameter under forest conditions. The crown is compact and pyramidal, growing up to wide. The bark is thick and reddish-brown, and becomes fissured between scaly ridges. The branches are stout and usually horizontal, but often slightly drooping. The shoots are red-brown to orange-brown, and finely hairy. The

leaves A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

are long and broad, flattened, not tapering toward their ends, with a rounded or slightly notched apex; they radiate outward in all directions from the twigs, and smell of tangerine if crushed. They are glossy dark green above and paler on the underside, with two white

stoma In botany, a stoma (from Greek ''στόμα'', "mouth", plural "stomata"), also called a stomate (plural "stomates"), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange. The pore is bor ...

tal bands. The

cones A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex. A cone is formed by a set of line segments, half-lines, or lines conn ...

are long, green, maturing light to mid-brown 6–7 months after pollination. When fully open, their scales are positioned at a right angle or reflexed to the central axis.Gymnosperm Database
''Tsuga caroliniana''
.Flora of North America
''Tsuga Caroliniana''

Threats

The

hemlock woolly adelgid The hemlock woolly adelgid (; ''Adelges tsugae''), or HWA, is an insect of the order Hemiptera (true bugs) native to East Asia. It feeds by sucking sap from hemlock and spruce trees (''Tsuga'' spp.; ''Picea'' spp.). In its native range, HWA ...

(''Adelges tsugae''), an adelgid introduced to the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

from

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area ...

in 1924, threatens Carolina hemlock, which is as susceptible as the related

eastern hemlock ''Tsuga canadensis'', also known as eastern hemlock, eastern hemlock-spruce, or Canadian hemlock, and in the French-speaking regions of Canada as ''pruche du Canada'', is a coniferous tree native to eastern North America. It is the state tree of ...

Horticulture

Carolina hemlock is used more often as an

ornamental tree Ornamental plants or garden plants are plants that are primarily grown for their beauty but also for qualities such as scent or how they shape physical space. Many flowering plants and garden varieties tend to be specially bred cultivars that i ...

than for timber production, due to its overall rarity. In

landscaping Landscaping refers to any activity that modifies the visible features of an area of land, including the following: # Living elements, such as flora or fauna; or what is commonly called gardening, the art and craft of growing plants with a goal o ...

, it is similar in appearance to eastern hemlock, but the Carolina hemlock has a deep

taproot A taproot is a large, central, and dominant root from which other roots sprout laterally. Typically a taproot is somewhat straight and very thick, is tapering in shape, and grows directly downward. In some plants, such as the carrot, the taproo ...

, compared with the shallow, aggressive roots of eastern hemlock. This means shrubs and other plants can be grown more easily under Carolina hemlock. Tsuga caroliniana branch

References

{{Taxonbar, from=Q1044374 caroliniana Flora of the Appalachian Mountains Trees of the Southeastern United States Natural history of the Great Smoky Mountains Plants described in 1881