68 ORCHIDACEAE. 



92. CYPRIPEDIUM. LADY'S SLIPPER. 



Glandular-pubescent herbs with leafy stems or scapes and 

 tufted roots of thick fibers; leaves large, broad, many-nerved; 

 flowers solitary or several, drooping, large, showy; sepals spread- 

 ing, separate or two of them united under the lip; lip a large 

 inflated sac; column bearing a sessile or stalked anther on each 

 side and a dilated petal-like sterile stamen above, covering the 

 summit of the style; pollinia granular; stigma terminal, broad, 

 obscurely 3-lobed. 



Flowers yellow; lip 15-30 mm. long. C. parviflorum. 



Flowers brown, with a white lip 30-50 mm. long. C. montanum. 



Cypripedium parviflorum Salisb. Stems 20-60 cm. high; leaves 5-12 cm. 

 long, elliptic to lanceolate; flowers 1-3, yellow, more or less marked with purple, 

 3-5 cm. long; petals linear, twisted; lip 15-30 mm. long; sterile anther tri- 

 angular, yellow and purple spotted. In springy places about Spokane. 



Cypripedium montanum Dougl. Whole plant glandular-pubescent; 

 stems 30-50 cm. tall, erect; leaves 4-6, oval, acuminate, 6-12 cm. long; flowers 

 1-3, pedicelled; sepals brown, usually dark, narrowly lanceolate, 5-6 cm. long; 

 upper petals like the sepals, but narrower and longer, wavy-twisted; lip white, 

 veined with purple, oblong, 30-50 mm. long; sterile anther somewhat triangular, 

 yellow with purple spots, about 1 cm. long. Woods and copses, rare. 



93. CORALLORHIZA. CORAL ROOT. 



Scapose herbs, saprophytes or root-parasites with large masses 

 of coral-like branching roots; leaves all reduced to sheathing 

 scales; flowers in terminal racemes; sepals nearly equal, the 

 lateral ones united at the base with the foot of the column, 

 forming a short spur or protuberance, the other one free, the 

 spur adnate to the summit of the ovary; petals about as long 

 as the sepals, 1-3-nerved; lip 3-ridged; column nearly free, 

 slightly incurved, somewhat 2-winged; anther terminal; pollinia 

 4, in two pairs, oblique, free, soft-waxy. 



Lip entire, striate-veined. C. striata. 

 Lip 3-lobed. 



Sepals and petals 1 -nerved; lip white. C. corallorhiza. 



Sepals and petals 3-nerved; lip spotted. C. maculata. 



Corallorhiza striata Lindl. Whole plant reddish-purple, 15-40 cm. high, 

 the spike 15-25-flowered; sepals and petals each with 3 conspicuous nerves; 

 lip entire, somewhat fleshy, ovate, narrowed below, concave and bearing 2 

 short prominent ridges near the base. Blue Mountains and Thatuna Hills, 

 Idaho. Rare. 



Corallorhiza corallorhiza (L.) Karst. Scapes 10-20 cm. tall, pale yellowish, 

 3-15-flowered; sepals lanceolate, somewhat acute, 1-nerved, 3-4 mm. long; 

 spur very short; petals like the sepals but broader, obtuse; lip oblong, obtuse 

 or notched, somewhat 3-lobed; column shorter than the petals. Very rare 

 in deep woods, in the mountains. 



