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.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.