OECHIDACEAE 



311 



39. 

 40. 



Sepals more strongly developed than the petals. 

 Flowering stem lateral. 



Leaves convolute in the bud. 



Lip encompassing the column or growing to it, without a 

 sac: poUinia 4 or 8, with caudiculae, but without stipes. 

 PoUinia 8: lip sessile, the crests on the middle lobe. 

 Pollinia 4: lip stalked, the crests below the middle lobe. 

 Lip articulated to the foot of the column, or forming with it a 

 spur: pollinia 2 or 4, without caudiculae but with 

 short stipes. 

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

 Lip sessile, the base truncate or cuneate : foot of the column 

 dilated or abruptly narrowed at the base. 

 Lip crestless, deeply 3-lobed, the lateral lobes widely 

 spreading: foot of the column concave and grooved, 

 not dilated, the margins thick. 

 Lip with a crest of nipple-like papillae, shallowly 

 3-lobed: foot of the column flat, thin and dilated, 

 the margins thin. 

 Leaves duplicate in the bud. 



Leafy shoots with a limited growth, the single year's growth 

 sympodially arranged. 

 Anther upright. 

 Anther inclined. 



Perianth spurred. 

 Perianth not spurred. 

 Leafy-shoots with unlimited growth. 



Pollinia sessile: lip long-spurred; the apex or the middle 



lobe again lobed. 

 Pollinia stalked: lip saccate or short-spurred, the apex entire 

 Flowers in a stiff spike: lip partially adnate to the 



column, usually saccate at the base. 48. 



Flowers in a lax raceme: lip sessile at the base of the 



column, with a globular spur. 49. 



38. Pleurothallis. 



Bletia. 



Aplectrum. 



41. CVRTOPODIUM. 



42. 



43. 



Triorchos. 

 Platypus. 



44. Macradenia. 



45. 

 46. 



lONOPSIS. 



Oncidium. 



47. polyrhiza. 



Campylocentrum. 

 Harrisella. 



1. CYPRIPEDIUM L. 



Caulescent herbs with fibrous roots. Leaves several: blades plaited. Lip a 

 horizontal sac. Stamens appressed, the free tips directed forward. Spring. Ladies' 

 Slipper. Moccasin Flower. 



Sterile stamen with the stalk wholly adnate to the column, the blade rounded at the base: column 



wings short and broad: lip longer than the sepals and petals. 1. C. reginae. 



Sterile stamen with the stalk partially adnate to the column, the blade not 

 rounded at the base: column-wings long and narrow: lip shorter than the 

 sepals and petals. 

 Sterile stamen with a triangular-ovate blade, less than 1 cm. long, obtuse: 



lip pale yellow: flowers fragrant. 2. C. 



Sterile stamen with an oblong-ovate or ovate-lanceolate blade over 1 cm. long, 



acute : lip golden yellow : flowers not fragrant. 3. C. 



paTvifloTum. 

 pubescens. 



1. Cypripedium reginae Walt. Stem 3-6 dm. tall : leaf -blades oval or elliptic, 

 8-20 cm. long: sepals white, oblong to oval: petals white, lanceolate, barely as long as 

 the sepals: lip about 4 cm. long, with purple and white stripes: capsule-body 3-4 em. 

 long. 



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



2. Cypripedium parviflorum Salisb. Stem 3-5 dm. tall: leaf -blades elliptic 

 to oval, 6-12 cm. long: sepals lanceolate to oblong-lanceolate, 2.5-3.5 cm. long; petals 

 longer and narrower than the sepals: lip 1.5-2.5 cm. long: capsule-body 2-3.5 cm. 

 long. 



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

 Washington. 



3. Cypripedium pub6scens Willd. Stem 3-7 dm. tall : leaf -blades oblong or 

 elliptic, 9-15 cm. long: sepals ovate-lanceolate or oblong-ovate: petals linear or 

 attenuate, longer than the sepals: lip 3.5-5 cm. long: capsule-body 3.5-4 cm. long. 

 [C. liirsutum Morong. Not Mill.] 



In woods and on banks, Nova Scotia to Ontario, Minnesota, Georgia and Nebraska. — 

 Specimens of a large-flowered form of this species or a related undescribed species have 

 been collected near David, Mississippi. 



2. FISSIPES Small. 

 Acaulescent herbs, with fibrous roots. Leaves mostly 2: blades plaited. Lip a 

 drooping sac. Stamens spreading, the free tips at right angles to the column. 

 Moccasin Flower. Purple Slipper. 



