ORCHIDACEAE (ORCHID FAMILY) 67 



ing a column; perfect anthers 1-2. Ovary inferior; stigma con- 

 cave, upper margin often a beak. Capsule dehiscent, usually 

 3-celled and loculicidal. Seeds very many, minute, mostly spindle- 

 shaped. 



A. Plants without green herbage, often reddish, saprophytic or parasitic. 



B. Stems white; flowers white, spurless. C. E. — (Gli. cephaln = a head, 

 anthcra = anther.) Cephalanthera austinae (snow orchid) 



BB. Stems more or less purplish; flowers white or reddish, spurred. 



CORALLORHIZA (p. 69) 

 AA, Plants with ordinary green herbage, not saprophytic nor parasitic. 



C. Leaf r; flower i; plant bulbous. W. E, — (Honor of the Greek goddess 

 Calypso, who once held Ulysses captive.) Calypso bulbosa (calypso) 



CC. Leaf more than i ; flower usually more than i ; plants mostly not bidbous. 

 D. Fertile anthers 2; lip an inflated sac. CyPRIPEDIUM (p. 67) 



DD. Fertile anther i ; lip not saclike (except Epipactis) . 

 E. Leaves 2. 

 F. Leaves near middle of stem, opposite. LISTERA (p. 69) 



FF. Leaves basal, alternate. 

 G. Leaves orbicular; flowers spurred; lip 12 mm. long. W. C. E. — (Gk. 

 lysis = a loosening; application doubtful.) Lysias orbiculata 



GG. Leaves elliptic-lanceolate to oblong; flowers spurless; lip 5 mm. long, 

 yellowish green. E. — (Gk. Uparos = fat or shining; referring to the 

 smooth leaves.) Liparis loeselii (spurless orchid) 



EE. Leaves more than 2. 

 H. Flower spurred; spur 2 mm. or more long. 



I. Stem leaves abruptly reduced to bracts; leaves withering at flowering ; 

 lateral sepals with base adherjng to claw of lip; tubers rounded; spike 

 spirally twisted. PIPERIA (p. 68) 



II. Stem leaves gradually reduced to bracts; leaves not withering until fruit 

 is formed; lateral sepals free; tubers elongated, rootlike; spike not spirally 

 twisted. LIMNORCHIS Ip. 68) 



HH. Flowers spurless. 

 J. Leaves without whitish spots or lines; flowers in a dense spike which is 

 somewhat spiral; lip not distinctly saclike at base, with a hornlike projec- 

 tion on each side near base. SPIRANTHES (p. 69) 

 JJ. Leaves with whitish spots or lines; flowers in a loose spike or raceme 

 which is not at all spiral; lip saclike at base, without projections near base: 

 K. Stem leafy at least below; perianth strongly purple-veined. W. E. 

 — (The Greek name.) Epipactis gigantea (helleborine) 

 KK. Leaves all basal; perianth not purple-veined. W. C. E. — (L. per = 

 through, amium. = love; on account of reputed medicinal properties.) 



Peramium decipiens (rattlesnake plantain) 



CYPRIPEDIUM (Lady's-slipper) 



Glandular-pubescent. Leaves large, wide, many-veined, sheathing at 

 base. Flowers in a leafy raceme or solitary, large, showy. Sepals spreading, 

 separate, (ir 2 of them united under the lip. Petals similar to the sepals 



