62 ORCHID FAMILY 



in size and shape. Filaments united with the style to form a 

 column which is capped by the single anther (anthers 2 in 

 Cypripedium). Ovary inferior, developing into a 3-celled cap- 

 sule with numerous minute seeds. 



A. Plants without green herbage; the leaves reduced and 

 scale-like. 



Herbage pink or reddish 7. Corallorhiza. 



Herbage pure white 3. Cephalanthera. 



B. Plants with green herbage. 



Lower petal with a slender spur at base 2. Habenaria. 



None of the petals spurred. 



Leaves a single rounded pair midway of the low stem; 



flowers green 6. Listera. 



Leaves several, basal; flowers white to flesh-color. 

 Sepals y 2 in. or less long. 



Raceme spirally twisted 5. Spiranthes. 



Raceme straight 4. Epipactis. 



Sepals l l /t to 2 l / 2 in. long; lip an inflated sac 1. Cypripedium. 



1. CYPRIPEDIUM. Lady's Slipper. 



1. C. montanum Dougl. Mountain Lady's Slipper. Leaves 

 sessile, acute, broadly ovate, clasping, 4 to 6 in. long, 2 or 3 

 in. broad, pubescent (like the stems) with short glandular 

 hairs. Flowers 1 to 3, short-pediceled. Sepals and wavy- 

 twisted petals linear-lanceolate, \y 2 to 2 in. long, purplish; 

 lip an inflated sac, 1 in. long, dull white, veined with purple. 

 Capsule nearly erect, oblong, ^ to 1 in. long. 



The Mountain Lady's Slipper is a stout, leafy plant, 1 to 

 2 ft. high, from a tuft of fibrous roots. It grows in moist 

 places around Yosemite Valley, the Mariposa Grove, etc., 

 and is often gathered because of its peculiar, showy flowers. 



2. HABENARIA. Rein-orchis. 



Erect plants with simple stems from a cluster of fleshy 

 roots, passing above into slender spikes of white or greenish 

 flowers. Leaves closely sessile, the lower clasping or sheath- 

 ing the stem. Lower petal, or lip, flat and spreading, with a 

 slender spur at base. 



1. H. unalaschensis Wats. Slender plant, a foot or so high. 

 Leaves all near the base, 3 to 5 in. long, ^ to 3 A m - wide. 

 Flowers small, greenish, widely separated in the open spike, 

 much exceeding the bracts. Petals, sepals, and lip each about 

 Vn in. long, the narrow spur slightly longer; upper petals 

 straight. Capsule oblong, sessile or nearly so, when mature 

 y 2 in. long. — In good soil of pine and fir forests, but not in 

 wet places. 



