Habitat:
Long-abandoned dolomite quarry, still used for storing piles of road gravel and asphalt. Weedy, with Conyza canadensis, Setaria faberi, Ambrosia trifida, Panicum capillare, and with some less weedy native prairie species, Verbena stricta, V. urticifolia, Agastache scrophulariifolia, Andropogon gerardii, Euphorbia corollata, Kuhnia eupatorioides.
Occurrence Remarks:
A number of plants, strictly erect. Corolla violet.