Tall, stout, glabrous annual (perennial and arborescent in warmer climates) with large (1-4 dm wide), peltate, subrotund, palmately 6-11-lobed lvs and large racemes of fls; seeds 1 cm, violently poisonous; 2n=20. Rarely adventive in waste places with us.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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