Verbena stricta (Hoary Verbena)
Verbenaceae (Vervain)
Verbena stricta grows in dry meadows on the plains. Purple flowers are in long spikes. Leaves are thick and toothed. Plants grow as tall as 3 feet.

Compare to Verbena hastata, which grows in wet areas.  V. hastata has narrower spikes and smaller flowers. It also has longer leaves, often with basal lobes. The difference in habitats is enough to separate the species.

Vegetation zone:  Plains
Time of bloom:  June - September
Origin:  Native
Eastern Colorado Wildflowers