Listera cordata (L.) R. Br. ex Ait. f. | Species Image Gallery (opens in a new window) |
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TAXONOMY | |||||||||
Family: | Orchidaceae | ||||||||
Genus: | Listera | ||||||||
Species Synonyms: | none | ||||||||
Common Names: | heartleaf twayblade | ||||||||
DISTRIBUTION | |||||||||
Canada: | Yukon – southwestern Mackenzie District – British Columbia – Alberta – Saskatchewan – Manitoba – Ontario – Quebec – Newfoundland – Nova Scotia | ||||||||
Saskatchewan: | widespread; Lake Athabasca – Duck Mountain | ||||||||
Ecoregion: | Boreal Transition, Mid-Boreal Upland, Athabasca Plain, Churchill River Upland | ||||||||
HABITAT | |||||||||
Saskatchewan: | wet, mossy spruce woods | ||||||||
Canada: | damp, mossy woods and openings | ||||||||
RARITY STATUS | |||||||||
Provincial
Status According to Harms (2003): |
Vulnerable |
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Nature Conservancy Status: | G5 S2 |
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Saskatchewan
Species at Risk Status: |
None |
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COSEWIC Status: | None |
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Heartleaf twayblade is listed as vulnerable but is apparently secure in Saskatchewan. Most local populations are small. No immediate threats are known but are possible in the future. | |||||||||
SPECIES DESCRIPTION | |||||||||
Height: | 5 – 30 cm | ||||||||
Roots: | fibrous | ||||||||
Stems: | fleshy, green to reddish-purple, hairless | ||||||||
Leaves: | usually below the middle of the stem, 1 – 4 cm long, ovate to kidney-shaped, base heart-shaped or square, tip with an abrupt point | ||||||||
Inflorescence: | unbranched, 2 – 10 cm long, 5 – 25-flowered, dense to lax; floral bracts ovate; inflorescence stalk and central axis glandular-hairy to hairless; flower stalks 2 – 3 mm long, slender | ||||||||
Flowers: | sepals and petals 2 – 3 mm long, yellowish-green, green, or purplish-green; dorsal sepal ovate to elliptic, lateral sepals slightly sickle-shaped; petals elliptic to linear; lip 4 – 5 mm long, linear, cleft to about halfway to the base; column to 0.5 mm long | ||||||||
Fruits: | capsule erect, round | ||||||||
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