Index- plants in this Family
Orchidaceae / Orchid
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 pair.
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.

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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.

See the links below this image for other images. (1)
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Heartleaf Twayblade (Listera cordata) - flowers  © Daniel Reed

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More Info:  
The Search below may provide more information about this species. Some of URLs may have been used as a source for this page not otherwise cited. Most of the information not cited comes from multiple sources that can be found in the Books page. The USDA plant links are provided by: USDA, NRCS 1999. The PLANTS database ( National Plant Data Center, Baton Rouge, LA 70874-4490 USA. You can check species names at ITIS Advanced Search to see if they meet the current ITIS taxonomic criteria.

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.

Wildflo 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.

Angiosperms / Flowering Plants
Monocots / One Seed Leaf



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