Biennial; lvs 3-parted, the lfls coarsely and doubly serrate to incised, the lateral often deeply lobed; bractlets ovate, subscarious; fls white, the fertile sessile, the staminate few, on slender pedicels to 8 mm and much exceeding the fertile; sep lance-subulate, exceeding the pet; fr ovoid to oblong, 6-8 mm, including the comparatively few bristles, the sep lanceolate, connivent, exceeding the bristles, forming a conspicuous beak 2-2.5 mm; oil-tubes numerous. Woods; Vt. and adj. Que. to s. Wis. and ne. Io., s. to N.C. and Tenn. June-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.