(Tufted Evening Primrose)

_DSC1056%20copy

Oenothera cespitosa ssp. cespitosa, Pawnee Buttes, Weld Co. 7710

_DSC1056%20copy

Oenothera cespitosa ssp. cespitosa, Pawnee Buttes, Weld Co. 7710

_DSC1056%20copy

Oenothera cespitosa ssp. cespitosa, Pawnee Buttes, Weld Co. 7710

Scientific Name Oenothera cespitosa ssp. cespitosa (Oenthera caespitosa ssp. caespitosa) USDA PLANTS Symbol OECAC2
Common Name Tufted Evening Primrose ITIS Taxonomic Serial No. 27383
Family Onagraceae (Evening Primrose) SEINet
Reference
Click Here
Description Life zones and habitat: Plains to montane (4600 to 10000 ft.); dry soils in grasslands and among sagebrush.
Plant: Perennial growing in tufts, up to 12 inches tall, usually stemless; herbage with very short hairs.
Leaves: Basal, petiolate leaves with lanceolate to elliptic blades, 4 to 10 inches long (including petiole) and 3/8 to 1-inch across; margins dentate or irregularly pinnatifid to entire.
Inflorescence: Large, white, showy, solitary flower borne from among the leaves on a short pedicel up to 1-1/4 inches long, petals turning dark rose-purple with age; greenish to reddish floral tube 1-1/2 to 5-1/5 inches long; 4 downward-pointing sepals 3/4 to 2 inches long; protruding style with 4-pronged stigma and 8 protruding white stamens; flowers open around sunset and wilt the next day.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and UW Burke Herbarium.
BONAP Distribution Map

Colorado Status:
Native

© Tom Lebsack 2022

Banner photo: Ten Mile Range and Rhodiola integrifolia (King’s Crown) in Summit County