KEY TO THE SPECIES 13 



becoming a pod with innumerable very minute seeds. (See 

 Plant Structures, p. 249, also Figs. 235-237 ; also Plant Rela- 

 tions, p. 127, Fig. 123, also Figs. 137-142.) 



» With tufted fibrous roots. 



1. Cypripedlum. The lip a large inflated sac. 



* * With fascicled fleshy roots. 



2. L.iinnorchls. Stem leafy : flower spike not twisted. 



3. Gyrostachys. Stem leafy below only ; flower spike twisted. 



* * * Bulb-bearing. 



4. Calypso. Stem naked, a single basal leaf. 



1. CYPRIPEDIUM (Lady-slipper) 



Herbs with large many-nerved leaves sheathing at base, solitary or few large 

 and showy flowers, spreading sepals, usually narrow petals, lip a large inflated 

 sac, and a declined column. 



1. Cyprlpedium parviflorum Salisb. (Small Lady-slippee). Stems 3-5 

 dm. high ; leaves oval to lanceolate, 4-13 cm. long ; sepals and petals longer than 

 the bright yellow lip, which is marked with purple stripes or blotches, flattened 

 from above, 2-3 cm. long. In bogs and damp woods. Bare. 



3. LIMNORCHIS 



Leafy plants, with fleshy roots ; flowers white or greenish in a long spike ; 

 sepals and petals spreading, the lip entire ; column short ; glands naked. 



1. JLimnorchis viridiflora (Cham.) Rydb. (Green Orchis). Stem stout and 

 leafy, 2-4 dm. high ; leaves lanceolate, obtusish or acute ; spike crowded, 6-13 

 cm. long ; flowers small, greenish, the lip lanceolate ; ovary more or less twisted. 

 In bogs and wet woods. 



3. GYROSTACHYS (Lady Tresses) 



Herbs, leafy below, from fleshy roots ; flowers small, spirally 3-ranked ; lip 

 dilated, embracing the column, imdulate or crisped at apex ; capsule erect. 



1. Gyrostachys strlcta Bydb. (Hooded Ladv Tresses). Stems naked 

 above, 1-3 dm. high ; leaves smooth, narrowly oblanoeolate or oblong'; spike 5-10 

 cm. long ; bracts shorter than the white fragrant flowers ; oblong lip thin and 

 veined. 



4. CALYPSO 



Lowbulbous herb, with a single thin ovate leaf, a short naked stem bearing a 

 large arid showy (variegated purple, pink and yellow) flower, nearly similar 

 spreading pointed sepals and petals, a sac-shaped inflated lip larger than the rest 

 of the flower, and a broadly winged petal-like column. 



Calypso bulbosa (L.) Oakes (Calypso). Bulb solid, with ooralloid roots ; 

 the low scape sheathed by 3-3 loose scales ; leaf ovate, subcordate ; Hp woolly- 

 hairy inside. Moist spruce and pine woods. 



