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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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| Listera borealis 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, succulent, glabrous, green | ||||||||
| Leaves: | 2, opposite or subopposite, near middle of stem, 1 – 5 cm long, elliptic to lanceolate, apex obtuse to rounded, green to dark bluish-green | ||||||||
| Inflorescence: | raceme 2 – 9 cm long, 5 – 20-flowered; bracts lanceolate to oblong; peduncle and rachis glandular pubescent; pedicels filiform, glandular pubescent or glabrous | ||||||||
| Flowers: | calyx and corolla greenish or yellowish with darker green veins, reflexed; dorsal sepal linear to lanceolate, falcate; corolla linear to oblong, falcate; labellum slightly narrowed in centre, shallowly notched, auricles divergent; column 2 – 3 mm long | ||||||||
| Fruits: | capsule ellipsoid | ||||||||
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