Thlaspi montanum (Fendler's Pennycress)
Family:
Brassicaceae (Mustard)
  
Thlaspi montanum grows at a wide range of elevations and has a long flowering period. In the foothills, the white blooms can be found in early spring. At higher elevations, flowering lasts into midsummer. Flowers are clustered in a fairly dense raceme toward the top of the stem. Stem leaves are alternate, somewhat thick and clasp the stem. Fruit are held upright or spreading outward from the stem, but do not droop.

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