26 The Ohio Naturalist. [Vol. X, No. 2, 



15. Lip not fringed nor cut-toothed, flowers greenish or whitish 10 



16. With one large and a much smaller leaf besides smaller bracts on the 



stem; beak of the stigma with 3 oblong or clavate appendages. 

 Gymnandeniopsis 



16. With several large leaves on the stem 17' 



17. Spur slender, straight, longer than the lip; lip hastate, with a tubercle 



at the base Perularia 



17. Spur much shorter than the lip, blunt, sac-like; lip 3-toothed at apex. 



Coeloglossum 



17. Spur seldom equalling the lip, blunt, slightly incurved, decidedly 



clavate; lip lanceolate, entire Limnorchis 



Cypripedium L. 



Glandular pubescent herbs, with leafy steins or scapes, and 

 thick tufted roots. Leaves large, broad, many-nerved. Flowers 

 large, showy, solitary or several. Sepals spreading, separate, or 

 two of thera united. Lip a large inflated sac. Column declined, 

 bearing a sessile or stalked anther on each side, and a dilated 

 sterile stamen above, which covers the summit of the style. 

 Pollen masses granular, without a caudicle or gland. Stigma 

 terminal, broad, somewhat 3-lobed. 



1. Plant 2-leaved, scape 1-flowered, lip fissured in front C. acaule 



1. Stem leafy to the top, 1 -several flowered, lip not fissured in .front, but 



with a rounded, open orifice 2 



2. Sepals and linear twisted petals acute, longer than the lip 3 



2. Sepals and petals not twisted, shorter than the lip or nearly equalling it. 



*. C. reginae 



3. Lip white, sterile stamen lanceolate C. caniidum 



3. Lip yellow, sterile stamen triangular C. parvifiorum 



1. Cypripedium acaule Ait. Stemless Lady's-slipper. Stem 16 



in. high, very pubescent; leaves 2, basal, 10-20 in. long, 4-8 

 in. wide, sparsely pubescent; sepals greenish-purple; petals 

 pink with darker veins, or sometimes white. A low plant 

 with 2 large leaves and a showy, fragrant flower, growing in 

 sandy or rocky woods. Medina, Portage, Hocking, Fairfield, 

 Stark and Cuyahoga Counties. 



2. Cypripedium reginae Walt. Show}^ Lady's-slipper. Stem 2 ft. 



high, very pubescent, leafy to the top; leaves elliptic, acute, 

 5-7 in. long, 2-5 in. wide; flowers 1-3; lip much inflated, 

 over 1 in. long, variegated with purple and white stripes. 

 A tall leafy plant with show}^ flowers growing in swamps and 

 woods. Fulton, Champaign, Lucas. Geauga, Portage, and 

 Muskingum Counties. 



3. Cypripedium candidum Willd. Small White Lady's-slipper. 



Stem 4—12 in. high, slightly pubescent, leaf}"; leaves 3 or 4, 

 elliptic or lanceolate, acute or acuminate, 3-5 in. long; 

 bracts 1—2 in. long, lanceolate; flowers solitary; lip white, 

 striped with purple inside, about 1 in. long. A small plant 

 with showy flower, growing in bogs and meadows. Wyandot 

 and Erie Counties. 



