"Spreading to erect annual to 6 dm, retrorsely to spreading-hirsute; lvs round-cordate, 2–6 cm wide, the 5–7 divisions from rather shallowly lobed (on the lower lvs) to incised- dissected into linear segments; pedicels commonly 2, subequal to the fruiting cal and peduncle; sep 4–5 mm, shortly awned, about equaling the retuse pet, elongating to 6–8 mm in fr; carpel-bodies with short, spreading, often glandular hairs ca 0.5 mm; seeds strongly reticulate-pitted; 2n=22. Native of Europe, intr. in our range from Mass. to Mich., s. to Ga. and Tex. Apr.–Aug."
Annual herb, stems up to ±60 cm long, erect or ascending, thinly pilose with retrorse eglandular hairs. Stipules ovate, acuminate. Radical leaves tufted, petioles up to ±150 mm long, pilose as the stems; blade up to ±50 mm in diam., deeply 5-7-lobed, each lobe cuneate in outline, deeply dissected, glabrous or sparsely hairy above, more densely so below particularly on the veins; cauline leaves similar but petioles rapidly shorter. Peduncles opposite the leaves and shorter than they, usually 2-flowered, pilose with spreading or somewhat retrorse hairs. Pedicels pilose with spreading hairs, some gland-tipped. Sepals ±4 x 2 mm, glandular-pilose. Petals ±5 x 2 mm, obovate, notched, purplish-pink. Rostrum glandular-pilose. Carpels smooth, hairy.