Oenothera howardii
(Howard's Evening Primrose)
Family:
Onagraceae (Evening Primrose)

Oenothera howardii is a yellow, stemless Evening Primrose with large, showy flowers. It is found on dry slopes and shale outcrops.

Vegetation zone:  Plains, Foothills
Time of bloom:  May - July
Origin:  Native
Eastern Colorado Wildflowers