Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
A Eurasian sp., is occasionally adventive near the coast. It is glabrous and has very dense racemes with apiculate, conspicuously ridged or reticulate or warty frs; 2n=32. (C. procumbens)
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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