Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
With the lvs in 4's, the fls sessile in the axils, barely extends n. of the Missouri R. in c. Mo.
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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