Oenothera flava

(Yellow Evening Primrose)

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Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0919

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Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0917

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Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0910-2

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Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0910

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Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0912

Scientific Name Oenothera flava USDA PLANTS Symbol OEFL
Common Name Yellow Evening Primrose, Long-tube Evening Primrose ITIS Taxonomic Serial No. 27397
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Life zones and habitat: Plains to subalpine (5500 to 10500 ft.); sandy, gravelly loam soils in meadows, sagebrush areas, floodplains and disturbed areas.
Plant: Low-growing, stemless perennial up to about 8 inches tall.
Leaves: Dense basal rosette of leaves that are oblanceolate to oblong in outline with entire or irregularly pinnately-lobed margins; 2 to 12 inches long.
Inflorescence: Solitary trumpet-shaped yellow blossoms arising from the center of the basal rosette with a purplish floral tube 1-1/4 to 5+ inches long; corolla with 4 spreading petals up to 3/4-inch long; 8 stamens of unequal length; protruding yellow cross-shaped stigma extends beyond the stamens; 4 sepals below bend backward; blossom opens in the evening and closes the next morning, corolla fading to pink or purple.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, Wildflowers of New Mexico and UW Burke Herbarium and Yavapai County Plants.
BONAP Distribution Map


Map Color Key
Colorado Status:
Native

© Tom Lebsack 2022

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