Cerastium fontanum (Mouse-ear Chickweed)
Family:
Alsinaceae (Chickweed)
     
The sepals of Cerastium fontanum are close to the same length as the petals. Compare to Cerastium strictum with sepals that are shorter than the petals.

Vegetation zone:  Foothills, Montane
Time of bloom:  April - July
Origin:  Native
Eastern Colorado Wildflowers