Pycnanthemum flexuosum Britton, Sterns & Poggenb.

Floras and Monographs

Pycnanthemum flexuosum Britton, Sterns & Poggenb.: [Book] 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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