Cypripedium reginae
Fl. Carol., 222. 1788.
Plants erect, 21–90 cm. Leaves 3–9, along length of stem, alternate, ascending to spreading; blade broadly elliptic to ovate or elliptic-lanceolate, 10–27 × 5–16 cm. Flowers 1–3(–4); sepals white; dorsal sepal suborbiculate to ovate-orbiculate, 25–45 × 18–42 mm; lateral sepals connate, synsepal 24–42 × 15–37 mm; petals spreading, same color as sepals, oblong to elliptic or ovate-lanceolate, flat, 25–47 × 6–17 mm; lip white, usually suffused around orifice and variably beyond with pale pink to crimson magenta, subglobose-obovoid, 25–53 mm; orifice basal, 18–28 mm; staminode cordiform-ovoid to ovoid-lanceoloid. 2n = 20.
Phenology: Flowering May–Aug.
Habitat: Coniferous and hardwood fen forests, openings, fen meadows, hillside seeps, meadows, prairies, dune lags, seeping cliffs
Elevation: mostly 0–600 m
Distribution
Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Ark., Conn., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Pa., Tenn., Vt., Va., W.Va., Wis.
Discussion
Selected References
None.