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| Listera borealis Morong. | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||
| Family: | Orchidaceae | ||||||||
| Genus: | Listera | ||||||||
| Species Synonyms: | none | ||||||||
| Common Names: | northern listera northern twayblade |
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| DISTRIBUTION | |||||||||
| Canada: | Yukon – Mackenzie District – British Columbia – Alberta – southwestern and central Saskatchewan – Manitoba – Ontario – Quebec – southern Labrador - Newfoundland | ||||||||
| Saskatchewan: | central and southwestern Saskatchewan; Cypress Hills, Loon Lake – Duck Mountain | ||||||||
| Ecoregion: | Cypress Upland, Boreal Transition, Mid-Boreal Upland | ||||||||
| HABITAT | |||||||||
| Saskatchewan: | wet, mossy spruce woods | ||||||||
| Associated Species: | dry humus of coniferous forests and thickets | ||||||||
| RARITY STATUS | |||||||||
| Provincial
Status According to Harms (2003): |
Threatened |
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| Nature Conservancy Status: | G5 S1 |
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| Saskatchewan
Species at Risk Status: |
None |
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| COSEWIC Status: | None |
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| Northern listera is threatened because it is rare or uncommon in Saskatchewan. It is only somewhat restricted but is almost always locally sparse. Possible threats are inferred by occurrences in heavily populated areas, fragile habitats, or areas of possible planned developments. | |||||||||
| SPECIES DESCRIPTION | |||||||||
| Height: | 5 – 25 cm | ||||||||
| Roots: | rhizome short; roots fibrous | ||||||||
| Stems: | slender to stout, slightly 4-angled, fleshy, hairless, green | ||||||||
| Leaves: | 2, opposite or subopposite, near middle of stem, 1 – 5 cm long, elliptic to lance-shaped, apex obtuse to rounded, green to dark bluish-green | ||||||||
| Inflorescence: | unbranched, 2 – 9 cm long, 5 – 20-flowered; bracts lance-shaped to oblong; inflorescence stalk and main axis glandular-hairy; flower stalks thread-like, glandular-hairy or hairless | ||||||||
| Flowers: | sepals and petals greenish or yellowish with darker green veins, reflexed; dorsal sepal linear to lance-shaped, sickle-shaped; petals linear to oblong, sickle-shaped; lip slightly narrowed in centre, shallowly notched, lobes divergent; column 2 – 3 mm long | ||||||||
| Fruits: | capsule ellipsoid | ||||||||
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