Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
A sp. of s. U.S. with similar infl but with sharply 5-7-lobed lvs, sometimes also escapes from cult.
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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