Annual or biennial; stems several, diffusely ascending, 2–4 dm; basal lvs reniform, 3–5 cm wide, 5–7-cleft nearly to the base into deeply and narrowly cleft segments; cauline lvs similar, on shorter petioles, even the uppermost ones opposite; peduncles elongate; pedicels 2, elongate, minutely pubescent with appressed retrorse hairs; sep 5–8 mm excluding the subulate tip, antrorsely strigillose; pet purple, retuse, 8–10 mm; mature fr 2.5 cm, the stylar beak 4–5 mm, the carpel-bodies glabrous or sparsely pilose on the back, not wrinkled; 2n=18. Native of Europe, established as a weed from N.Y. to N.D., s to Ga. June–Aug.
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