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| Oenothera flava ssp. flava (A. Nels.) Garrett | Species Image Gallery (opens in a new window) |
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| TAXONOMY | |||||||||||||||||||||||||||
| Family: | Onagraceae | ||||||||||||||||||||||||||
| Genus: | Oenothera | ||||||||||||||||||||||||||
| Species Synonyms: | Lavauxia flava A. Nels. | ||||||||||||||||||||||||||
| Common Names: | yellow evening primrose | ||||||||||||||||||||||||||
| DISTRIBUTION | |||||||||||||||||||||||||||
| Canada: | southern Alberta – southern Saskatchewan | ||||||||||||||||||||||||||
| Saskatchewan: | southern Saskatchewan; Cypress Hills – Regina | ||||||||||||||||||||||||||
| Ecoregion: | Cypress Upland, Mixed Grassland, Moist Mixed Grassland | ||||||||||||||||||||||||||
| HABITAT | |||||||||||||||||||||||||||
| Saskatchewan: | moist clay flats in depressions, slough bottoms, creek shores, and roadside ditchesmoist clay flats in depressions, slough bottoms, creek shores, and roadside ditches | ||||||||||||||||||||||||||
| Associated Species: | barnyard grass, common plantain, narrowleaf dock, pale agoseris | ||||||||||||||||||||||||||
| 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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| Yellow evening primrose is vulnerable in Saskatchewan because it is limited to the southern portion of the province and most local populations are small. At the present time, this species appears to be secure and no immediate threats are known. | |||||||||||||||||||||||||||
| SPECIES DESCRIPTION | |||||||||||||||||||||||||||
| Growth Habit: | perennial, tufted | ||||||||||||||||||||||||||
| Roots: | taproot thick, fleshy | ||||||||||||||||||||||||||
| Stem: | absent | ||||||||||||||||||||||||||
| Leaves: | basal rosettes, blades 5 – 25 cm long, inversely lance-shaped to oblong, deeply lobed with downward pointing lobes on lower ½ of blade, midrib prominent on lower surface; stalks shorter than blades | ||||||||||||||||||||||||||
| Inflorescence: | flowers sessile in leaf axils | ||||||||||||||||||||||||||
| Flowers: | hypanthium tube 4 – 7 cm long; sepals 1 – 2 cm long, lance-shaped, green, free tips 1 – 5 mm long; petals 1 – 2 cm long, bright yellow, drying pinkish; stamens 1 – 2 cm long; style 1 – 2 cm long | ||||||||||||||||||||||||||
| Fruits: | capsule 1.5 – 3.5 cm long, narrowly ovoid, 4-winged; seeds dark reddish-brown to black, narrowly winged | ||||||||||||||||||||||||||
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