Glandularia bipinnatifida
(Dakota Mock Vervain or Prairie Verbena)
Family:
Verbenaceae (Vervain)
  
Dakota Mock Vervain, also called Prairie Verbena, is a common wildflower in fields and along roadsides of the southeastern Plains. Leaves are opposite. Flowers are in terminal corymbs (clusters at the end of the stem, arranged so the flowers appear to be at the same height).

Vegetation zone:  Plains, Foothills (3800 - 7300 ft.)
Time of bloom:  May - September
Origin:  Native
Eastern Colorado Wildflowers