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FNA | Family List | FNA Vol. 26 | Orchidaceae | Cypripedium

5. Cypripedium acaule Aiton, Hort. Kew. 3: 303. 1789.

Small pink lady’s-slipper, pink moccasin-flower, stemless lady’s-slipper, cypripède acaule

Fissipes acaulis (Aiton) Small

Plants erect, 15–61 cm; stems leafless scapes. Leaves 2, radical, arising directly from rhizome, ascending to spreading; blade broadly elliptic to oblong-, ovate-, or obovate-elliptic, 9–30 × 2.5–15 cm. Flowers solitary; sepals reddish brown to green; dorsal sepal lanceolate to lance-ovate or elliptic, 19–52 × 5–22 mm; lateral sepals connate, synsepal 17–49 × 6–25 mm; petals deflexed to somewhat spreading, somewhat spirally twisted, same color as sepals, linear- to ovate-lanceolate, 24–60 × 4–17 mm; lip magenta to white, obovoid to oblance-ovoid, 30–67 mm, orifice a longitudinal fissure, length of lip; staminode quadrangular to suborbicular-rhomboid or ovoid-deltoid. 2n = 20.

Flowering Apr--Jul. Dry to wet forests, bogs, brushy barrens, heath, and roadsides on highly acidic soil; mostly 0--1200 m; Alta., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask.; Ala., Conn., Del., D.C., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va., Wis.


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