Cypripedium acaule Aiton

• Authority

  Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

• Family

  Orchidaceae

• Scientific Name

  Cypripedium acaule Aiton

• Description

  Species Description - Lvs 2, basal, subopposite, narrowly elliptic, 1–2 dm, thinly hairy, pale beneath; scape 2–4 dm, hairy, with a single lanceolate bract arching forward over the solitary fl; sep and lateral pet yellowish-green to greenish-brown, lanceolate, 3–5 cm, the 2 lower sep united; lip drooping, pink with red veins, 3–6 cm, hairy within, cleft along the upper side from the basal orifice to the summit, the inturned margins in contact; 2n=20. In acid soil, from swamps and bogs to dry woods and sand-dunes; Nf. and Que. to Alta., s. to N.J. and n. Ind., and along the mts. and coastal plain to S.C. and Ala. Apr.–June. (Fissipes a.)

• Common Names

  mocasin-flower, pink lady-slipper