ORCHIDACEAE 311 



Pollen-masses 8 : plant terrestrial, the leaves all scale-like : 



inflorescence simple. 33. HEXALECTRIS. 



B. Flower-stalk lateral. 



Column without a foot : lip sessile. 34. BLETIA. 



Column with a foot. 



Lip sessile, the base truncate or cuneate : foot of the col- 

 umn dilated or abruptly narrowed at the base. 

 Lip crestless, deeply three-lobed, the lateral lobes 

 widely spreading: foot of the column concave 

 and grooved, not dilated, the margins thick. 35. TRIORCHOS. 



Lip with a crest of nipple-like papillae, shallowly 

 three-lobed : foot of the column flat, thin and 

 dilated, the margins thin. 36. PLATYPUS. 



Lip contracted into a claw: foot of the column slender. 37. CYRTOPODIUM. 



1. CYPRIPEDIUM L. 



Caulescent often scented herbs, with very long fibrous roots and glandular-pubescent 

 foliage. Leaves alternate : blades several-nerved, plaited. Flowers solitary or several, 

 near the top of the stem, drooping. Perianth showy. Sepals 3, distinct, or 2 usually 

 united under the lip, often twisted. Lateral petals 2, spreading. Lip conspicuous, hori- 

 zontal, an inflated sac with a rounded orifice. Column declined, glabrous, bearing a ses- 

 sile or stalked anther on each side and a petaloid sterile stamen above which covers the top 

 of the style. Stamens appressed, the free tips directed forward, surpassing the anthers : 

 sterile stamen longer than broad, glabrous. Pollen pulpy or granular, without glands or 

 tails. Stigma terminal, broadest at the base. Capsule ribbed. The plants flower in the 

 spring. LADIES' SLIPPER. 



Lip longer than the sepals and lateral petals. 1. C. reginae. 



Lip as long as the sepals and lateral petals or shorter. 



Lip bright yellow, 1.5-3 cm. long : stigma acute. 2. C. parviflorum. 



Lip pale yellow, 3.5-5 cm. long : stigma obtuse. 3. C. hirsutum. 



1. Cyprlpedium reginae Walt. Foliage villous-hirsute. Stems erect or ascending, 

 3-6 dm. tall, leafy to the top, usually stout : leaf-blades oval or elliptic, 8-20 cm. long, 

 acute, with large sheathing bases : flowers solitary or 2-3 at the top of the stem : sepals 

 white, oblong to oval : lateral petals white, lanceolate, barely as long as the sepals : lip 

 inflated, 2.5-4 cm. long, with purple and white stripes, shorter than the sepals and petals : 

 capsule oblong, 3-4 cm. long, excluding the stipe-like base. [(7. spectabile Salisb.] 



In swamps and woods, Nova Scotia to Ontario, Minnesota and Georgia. MOCCASIN FLOWER. 



2. Cypripedium parviflorum Salisb. Foliage glandular-villous. Stems erect or as- 

 cending, 3-6 dm. tall, often zigzag, commonly tufted : leaf -blades elliptic to oval, 8-15 cm. 

 long, acute or acuminate, glabrate : bracts similar to the leaves but smaller : perianth yel- 

 low, somewhat drooping: sepals lanceolate or oblong-lanceolate, 2.5-3 cm. long: lateral 

 petals longer and narrower than the sepals: lip inflated, bladder-like, 15-3 cm. long, 

 light yellow, shorter than the sepals and petals : capsule 2-3 cm. long. 



In woods and on hillsides, Newfoundland to British Columbia, middle Georgia, Missouri and 

 Washington, 



3. Cypripedium hirsutum Mill. Foliage glandular-pubescent or glabrate. Stems 

 erect or ascending, 3-7 dm. tall, simple, tufted : leaf-blades oblong or elliptic, 8-15 cm. 

 long, acute or acuminate, sheathing at the base : bract similar to the leaves : perianth yel- 

 low, drooping or horizontal : sepals ovate-lanceolate or oblong-ovate : lateral petals linear 

 or attenuate, longer than the sepals, twisted or curled: lip inflated, bladder-like, 3.5-5 

 cm. long, pale yellow, veined with purple : capsule elliptic, 3. 5-4 mm. long. [Oypnpedium 

 pubescens Willd.] 



In woods and on shaded banks, Nova Scotia to Ontario, Minnesota, the mountains of Georgia, and 

 Nebraska. GOLDEN SLIPPFR. 



2. FISSIPES Small. 



Acaulescent herbs, with fleshy-fibrous roots and glandular-pubescent foliage. Leaves 

 2, basal : blades ample, plaited, spreading. Scape simple. Flower usually solitary at the 

 top of the scape. Perianth irregular. Sepals greenish, narrowed upward. Lateral petals 

 about as long as the sepals, linear, greenish. Lip drooping, showy, a large inflated sac 

 with a closed fissure down its whole length in front. Column declined, glandular-pubes- 

 cent, bearing a sessile anther on each side, and a rhomboidal glandular-pubescent sterile 

 stamen above. Stamens spreading, the free tips at right angles to the column. Pollen 

 granular, without glands or tails. Stigma broadest at the apex. Capsule ascending. 



1. Fissipes acaulis (Ait.) Small. Foliage glandular-pubescent. Stem wanting : 

 leaf-blades sheathing the lower part of the scape, usually 2, oblong-elliptic or oval, 1-3 



