ORDER 138. ORCHID ACE^E. 681 



TRIBES AND GENERA, 



CTPRIPEDIELE. Anthers fertile, the 3rd a petal-like appendage over ll;o 



stigum. Lip a large, inflated spurless sack CYPBiPEDnm. 1 



OPHEYDE^E, &c. Anther only 1, terminal 1 or dorsal on the stigma. (*) 

 * * Lip produced behind into a spur 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 conceited in a pouch (Flowers large, rose-colored, lip entire) in ORCHIS. 2 



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

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



a Anther bent over the end of the stigma like a lid. Pollinia4 TIPCLARIA. 5 



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



C Lip a large, inflated sack with 2 spur-like points below the apex CALYPSO. 6 



C 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.IIIZRA. 8 

 d Lip concave, raised on a claw. Pollinia 4. Plant with 1 late leaf.. . APLECTRITM. 

 C Lip not saccate. Plants greeii and with leaves, (e) 



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



f Lip entire, dilated ; Column minute. (Leaf 1.) MTCROSTYUS. 10 



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



f Lip 2-lobed or cleft at apex. Lvs. 2, cauline opposite LISTERA, 12 



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



g Sepals reflexed. Lip arched and recurved, 8-lobed CRANICIHS. 13 



g Sepals erect. Lip ascending, embracing the column SPIRASTHES. 14 



Lip gibbous benoath, pointed at apex GOODYERA. 15 



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



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



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



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



k Column adherent to the tip below. Fls. purple ARETUUSA. IS 



k Column adherent to the hp. Fls. yellow. On trees EPIDENDRCM. 19 



I. CYPRIPE^DIUM, L. LADY'S SLIPPER. (Gr. Kfapi?, Venus, 

 -rodiov, 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 ; Ivs. 

 large, plaited, veined. 



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



* Stem leafy. Flowers 1 to 3, mostly but 1, yellow Nos. 1, '2 



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



* Stem a leafless scape, 2-leave*d at base. Flower rose-colored No. 5 



Sepals 8, the 2 lower entirely distinct No. 6 



1 C. pubescens Swartz. LARGE YELLOW LADIES SLIPPER. St. leafy, Ivs. 

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

 petals, 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 the 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 

 purple stripes and spots, the lower bifid, composed of '2 united sepals, the lateral 

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

 inside, with a roundish aperture. May, Jn. 



2 C. parviflomm Saliah. SMALLER YELLOW LADIES' SLIPPER, St. leafy ; Ivs. lan- 

 ceolate-acuminate ; 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 "\Vyman). More common 

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

 than in Xo. 1. Petals 1 to IS", twisted or not Upper sep. broadest. Lip evi- 

 dently flattened on the uj o- r ? ; dc. convex laterally, dull yellow. May, Jn. 



