Stanleya pinnata (Prince's Plume)
Family: Brassicaceae (Mustard)
Prince's Plume grows on dry sites on soils high in selenium, One of the taller and showier members of the Mustard family, flowers have four petals and six stamens. Prince's Plume accumulates selenium and can be poisonous to livestock.

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