Obdbb 138.— ORCHIDAOE^. QjBJt 



TBIBES AND GENERA. 



S OYPBIPEDIEi£l Anthers 2, fertile, tlio 8rd a petal-Uke appenOago over tbo 



stigma. Li|> a large, inflated spurless sack ...,..., Cvpkxpkdhi«, I 

 S OPHETDE^, i-c, Auther only 1, terminal or dorsal on Ibc stigma. (*) 



* Lip prodnced behind iuto a spui* which is free from the ovary, (a) 



a Anther erect, terminal; pollinia 2, granular, pedicellate and attached to as 

 many glands on the stigma, which glands are (b) 



b concealed in a pouch (Flowers large, rose-colored, lip entire) in Oscnie. 2 



b naked and close together (Flowers small, lip entire or toothed) in...GYMNADENiA, 3 

 b naked and widely separated (Lip entire or lobed, or cleft or fringed.) PtATANTUEiiA. 4 



a Anther bent over the end of the stigma like a ISd. Pollinia 4 Tipulama. & 



* Lip not produced Into a spur behind, or the spur is adnato to the ovary, (c) 



e Lip a large, inflated sack with 2 spur-like points below the opcx Caltpso. C 



O Lip not saccate. Plants brown, leafless, or with radical leaf, (d) 



d Lip hooded, i. e.. Its margins involute. Pollinia 8. Fls. expanding.. . . . Bletia. 7 

 d Lip concave, sessile, often with an adnate spur. Pollinia 4. ..Corallop-iiizea. 8 

 d Lip concave, raised on i\ claw. Pollinia 4. Plant with 1 late leaf. . . Aplectrum. 9 

 O Lip not saccate. Plants green and with leaves, (e) 



e Lip flat. Flowers obscure, in racemes nearly bractless. (f ) 



f Lip entire, ijilated ; Column minute. (Leaf 1.) Mycrostylis. 10 



f Lip sagittate or cordate. Column lengthened. Leaves 2 Lippaeis. 11 



f Lip 2-lobed or cleft at apex. Lvs. 2, cauUne opposite Listbra. 12 



e Lip channeled, recurved. Fls. whitish, in bracted spikes, (g) 



g Sepals reflexed. Lip arched and recurved, S-lobed CRANrcnrs. IS 



g Sepals erect. — Lip ascending, embracing the column Spieanthes. 14 



—Lip gibbous beneath, pointed at apex Goodveba. 15 



e Lip bearded or 3-lobed. Stamen lid-like. Flowers showy, (h) 



h Flowers several, purple, with a bearded lip posterior Calopogon. 16 



h, Flowers with the lip anterior (as in the order generally), (k) 



k Column free from the lip, clavate. Fls. purplish Pogqnia. 17 



k Column adherent to the tip below. Fls. purple Aeetiidsa. 18 



k Column adherent to the lip. Fls. yellow. On trees Epidendeum. 19 



1. CYPRIPE'DIUM, L. Lady's Slipper. (Gr. Kvirpig, Venus, 

 Trddiov, a slipper ; from the slipper-like form of the lip.) The 2 lower 

 sepals united into 1 segment, or rarely distinct ; petals spreading ; lip 

 inflated, saccate, obtuse ; column terminated by a petaloid lobe (barren 

 stamen) and bearing a 2-celled anther under each wing. — Fls. large, 

 very showy, distinguished for the large, inflated lower petal or lip ; lvs. 

 large, plaited, veined. 



§ Sepals 2, the lower compound of 2 united either wholly or near tho tip. (*) 



* Stem leafy. — Flowers 1 to S, mostly but 1, yellow ITos. ], S 



— Flowers solitary or several, white or ros6-colored Nos. 8, 4 



* Stem a le.aflesa scape, 2-leaved at base. Flower rose-colored No. 5 



§ Sepals S, the 2 lower entirely distinct .'No. C 



1 C. pubescens Swartz. Large Tellow Ladies Slippee. St. leafy, lvs. 

 broad-lanoeolate, acuminato; sepals lanceolate; lip shorter than the linear, twisted 

 I>etala, compressed laterally, convex both above and below ; sterile stamen triangular, 

 acute ; plant pubescent. — "Woods and meadows, Can. to Wis., S. to Ga. Sts. usu- 

 ally several from tho same root, If or more high. Lvs. 3 to 6' by 2 to 3, many- 

 veined, clasping at base. Flower mostly solitary. Segm. 4, greenish with 

 pui-ple stripes and spots, the lower bifid, composed of 2 united sepals, the lateral 

 2 to 3' by 3", wavy and twisted. Lip moccasm-shaped, bright-yellow, spotted 

 inside, with a roundish aperture. May, Jn. 



2 C. panriflorum Salish. Smaller Yellow Ladies' Slipper. St. leafy; lvs. lau- 

 ceolate-aeumihate ; sep. ovate or lance-ovate ; lip shorter than the petals, compressed 

 from above and beneath ; sterile stamen triangular, acute ; plant pubescent. — In 

 low woods and prairies. Can. to Wis. and Ga. (Miss Wyman). More common 

 westward. Plant 8 to 12' high, Tarely taller, very leafy. Flower a third smaller 

 than in No. 1. Petals 1 to 18", twisted or'not. Upper sep. brosdest. Lip evi. 

 dcntly flattened oc the upper .side, convex Literally, dull yellow. May, Jn. 



