Tragopogon pratensis (Meadow salsify)
Family: Asteraceae (Sunflower)
    
Phyllaries are the same length as the flowers. Compare with T. dubius (Yellow salsify), which has phyllaries longer than the flowers.  

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