Lathyrus latifolius (Perennial Sweetpea)
Family: Fabaceae (Pea)
Perennial Sweetpea is an escaped ornamental that usually grows along fences or roadsides. Tendrils allow the plants to climb. The leaf petioles are flattened and broad, which helps to identify this species.

Vegetation zone:  Plains, Foothills
Time of bloom:  May - July
Origin:  Introduced, escaped ornamental, can be invasive
Eastern Colorado Wildflowers