Waldst. & Kit.
Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
More herbaceous, with scabrous lvs that have narrowly ascending (or obscure) primary lateral veins, the flowering branches not erect, is reported to be locally established in Mass.
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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