Oenothera flava
(Yellow Evening Primrose)
Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0919
Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0917
Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0910-2
Oenothera flava, Along FR 109, Grand Mesa NF, Delta Co. 0910
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 2024
Banner photo: Castilleja rhexifolia and a brewing storm over the San Juan Mountains