Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
Is also rarely found as an escape. It has 2-3 styles and nutlets, and less deeply cut lvs; red-fld forms are common. (C. oxyacantha, misapplied)
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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