Heartleaf Twayblade (Listera cordata)
Plant Type: This is a herbaceous plant, it is a perennial which can reach 20cm in height (8inches). The stem
has some hairs above the leaves.
Leaves: The leaf arrangement is opposite. Leaves can
reach 3cm in length (1.2inches). There are two entire often wavy edged leaves located about on third of the way up the
stem. Often heart shaped, sometimes ovate or nearly deltoid, sessile. Rarely there is a third leaf above the
Flowers: The flowers are irregular in shape and are up to 0.6cm wide (0.25 inches).
They are green and purplish or maroon. Blooms first appear in mid spring and continue into early summer. Lower lip
narrow and deeply cleft. In a loose terminal raceme.
Habitat: Rich damp woods often near
water or in bogs, among Beech, Birch, Maple and often near Hemlock.
Range: Alaska to Minnesota
and Maine in the east, continuing south perhaps as far as North Carolina with the range narrowing to the Appalachian Mts.
In our area it has seldom been found anywhere other than eastern West Virginia. A variaty also in western U.S.
Color Photo More Info
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This Orchid is extremely rare in our area. It is occasionally found in
a few counties of eastern West Virginia and was once reported from a single county in western North Carolina. In the
south it is only found in cool mountain areas. Its small size and light color make it hard to locate so it is very possible that
other sites exist that have not been discovered.
Similar Species: Small's Twayblade (Listera smallii) is
easily distinguished by it's much wider and less deeply cleft lip.
By: Newcomb, Lawrence and Illustrated by Morrison, Gordon. 1977, Little, Brown and Company, ISBN:0-316-60442-9
One of the best general guides to wildflowers of the North Eastern and North Central United States. Newcomb's key
is an excellent, simple method for identifying plants. Newcomb has drawings for almost every plant mentioned that
are excellent aids to identifying the species. Though only the more common plants are covered this is often the first
book I pick up when trying to identify a wildflower.
wers of Tennessee the Ohio Valley and the Southern Appalachians
By: Dennis Horn and Tavia Cathcart and Thomas E. Hemmerly and David Duhl. , ISBN:1551054280
This is perhaps the best of many field guides covering this region. Featuring 446 excellent color photographs (located
with the text) and mentioning as similar to those illustrated are another 800 or so species for a total coverage of over
1,200 species. The start of each family section includes line drawings of some of the species showing important
features. The text includes the usual description, bloom season, range, habitat and additionally includes information
such as medical uses and lore and how the species was named. This is the official field guide of the Tennessee
Native Plant Society.
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Page updated on 5/19/2002 2:06:44 PM.