Robinia pseudoacacia (Black Locust)
Family: Fabaceae (Pea)
        
The white flowers of Black Locust have a yellow patch on the banner and hang in a raceme. Trees were planted on homesteads and persist, scattered on the plains and foothills.

Vegetation zone:  Plains, Foothills
Time of bloom:  May - June
Origin:  Introduced
Eastern Colorado Wildflowers