Pet and stamens each 5; carpels 2(3), the styles distinct; fr a berry-like drupe with 2(3) pyrenes; very prickly shrubs with large, simple, petiolate, lobed lvs and numerous crowded, head-like umbels in ample terminal racemes. Monospecific.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.