Stems coarse, scrambling to several m, strongly armed with flattened, recurved prickles; lvs evergreen, primarily (3)5-foliolate, the lfls laciniately cleft or again compound and cleft, the lower side evidently hairy but green; fls numerous in cymose panicles; cal-lobes usually prickly; pet pinkish to sometimes white, usually trifid; fr ±elongate, 1-1.5 cm thick; 2n=28. European cultigen, sparingly naturalized from Mass. to Minn. and southward. June-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.