Cypripedium calceolus var. parviflorum (Salis) Fernald
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Authority
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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Family
Orchidaceae
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Scientific Name
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Description
Variety Description - Smaller, with smaller, darker fls, the pet 3–5 cm, the lip 2–3 cm, chiefly of moist or wet low places, is northern and cordilleran, s. in our range to N. Engl., the Lake states, n. N.J., Pa., O., and at progressively higher elev. in the S. Appalachian Mts. to N.C. (C. parviflorum)