Annual, 2–4 dm, commonly branched from below the middle; lower lvs lance-ovate, 2–4 cm, broadly rounded to truncate or subcordate at the sessile base; rameal lvs lanceolate; fls all long-pedicellate, cal-tube 5-winged, the wings truncate or slightly projecting at the top; cal-lobes lanceolate, gradually tapering from base to tip, (10–)15–20(–25) mm, the strong lateral nerves much more prominent than the midnerve; cor-lobes lilac, mostly 15–22 mm; 2n=26. Variously wet or dry, usually ± open places; Ill. and Mo. to Miss. and Tex. June, July.
Prairies and fields. Open ground, edges of woods and roadsides, mainly in clay soils but also in sands.
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