Spreading or ascending annual, branched from the base, 2-5 dm; basal lvs rotund or reniform, 2-5 cm wide, 5-9 cleft, the segments usually 3-lobed at the summit; upper
lvs progressively reduced, the uppermost alternate; fls numerous; cal and pedicels densely glandular-puberulent and also hirsute; sep acute, 3-4 mm at anthesis; pet 5-7 mm, deeply notched; fr (including the cal) 9-13 mm, the stylar beak 2-5 mm, the carpel-bodies glabrous but usually with oblique, curved wrinkles; 2n=26. Native of
Europe and w. Asia, now widespread as a weed and found here and there in our range. Apr.-Sept.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.