Weedy, often freely branched perennial 2–10 dm from shallow, slender, stoloniform rhizomes; herbage and hypanthium evidently spreading-setose; stems inequably and often obscurely quadrangular, the 4 raised lines delimiting 2 narrow, flat to concave sides and 2 broader, often rounded ones; principal lvs lance-elliptic to lance-linear or lance-ovate, 2–5(–8) cm, seldom more than a third as wide; hypanthium mostly 6–10(11) mm at maturity, the neck as long as or longer than the body; pet 12–18 mm, dull lavender to white; generally glabrous; anthers 5–8 mm; 2n=22, 44. Moist, open places, often in disturbed habitats; Mass. to Fla., w. to s. Ind., s. Mo., and Tex.
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