From Flora of Indiana (1940) by Charles C. Deam
Frequent to common in all parts of the state in pastures, open woodland, fallow fields, lawns, and waste places.
Erect or ascending annual 0.5-3 dm, somewhat villous-hirsute below, usually more puberulent above; main lvs ovate or broadly elliptic, palmately veined, 0.5-1.5 cm, 1-2 times as long as wide, crenate-serrate, the lower generally short-petiolate; infl terminal, the bracts alternate; fls subsessile; cor blue-violet, 2-2.5 mm wide; mature pedicels only 1-2 mm; fr 3 mm, obcordate, ciliate-margined, with subglabrous sides; style 0.4-1 mm; seeds (5-)8-11 per locule, 0.8-1.2 mm; 2n=14, 16. Native of Eurasia, established as an inconspicuous weed in gardens, lawns, and fields in much of N. Amer. Apr.-Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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