326 ORDER 137. ORCHIDACE^E. 



n Lip entire, dilated. Column minute. (Leaf 1) MICBOSTYLIS 9 



n Lip sagittate or cordate. Column elongated. Leaves 2 LIPPARIS. 10 



n Lip 2-lobed or cleft at apex. Leaves 2 cauline, opposite LISTERA. 11 



o Lip with 2 lateral callosities, not at all saccate SPIRANTHKS. 12 



Lip without callosities, saccate, or even spurred at base GOODYKRA. 13 



x Flowers greenish. Lip potterfor, and beardless POWTHIEVA. 14 



x Flowers purple. Lip posterior, and bearded CALOPOGON. 15 



x Flowers purplish. Lip anterior (as in most Orchids)... (y) 



y Column free from the lip. Calyx spreading POGONIA. 16 



V Column adnate to the lip below. Calyx erect. Leaves ARETHUSA. 17 



y Column adherent to the lip. Calyx spreading. On trees, South EPIDENDRDM. 18 



1. CYPRIPEDIUM, L. LADY'S SLIPPER. The 2 lower sepals united 

 into 1 leaf, or rarely distinct. Pet. spreading. Lip inflated, saccate, ob- 

 tuse. Column terminated by a petaloid lobe (barren stamen), and bearing 

 a 2-celled anther under each wing. U With large plaited leaves and large 

 showy flowers. May, June. Fig. 71. 



Sepals 3, the two lower entirely distinct. Stem leafy No. 1 



Sepals 2, the lower composed of two united nearly to the tip ... (a) 



a Stem a leafless scape, 2-leaved at base. Flower rose-colored No. 2 



a Stem leafy. x Flowers solitary or several, white or rose-colored Nos. 3, 4 



x Flowers 13, mostly 1, yellow. Plant pubescent Nos. 5, 6 



1 C. arietinum Ait. Ram's Head. Stems usually clustered, 812', each 1- or 2- 



flwd. ; leaves elliptical ; upper sep. oblong-ovate, the lateral sep. and pet. lin. -lanceo- 

 late, lip obconic, as long as the pet. Damp woods, N. Eng. to Wis., and N. Curious. 



2 C. acaiile Ait. Scape 1014', bearing a single large (2') flower ; Ivs. elliptic-oblong : 



pet. lanceolate, shorter than the large boat-shaped lip. In damp woods. Beautiful. 



3 C. spectabile Sw. Stem leafy, 2f, hairy; Ivs. lance-ovate, acuminate ; sep. broad- 



ovate, obtuse, the lower (double) one smaller ; lip 2', white-purple. Swamps. Superb. 



4 C. c' undid urn Willd. St. leafy, If; Ivs. oblong-lanceolate, acute; fl. 1; sep. sub- 



equal ; lip 1', compressed, white, shorter than the (2') pet. Woods and prairies. 



5 C. parviflorum Salisb. St. very leafy, 812' ; Ivs. lanceolate, acuminate ; sepals 



ovate to lance-ovate ; lip depressed, shorter than the petals. Low woods and prairies. 



6 C. pubescens Sw. Large Yellow L. Stems usually clustered, If or more ; leaves 



broadly lanceolate, acuminate ; sepals lanceolate ; lip compressed laterally, moccasin- 

 shaped, shorter than the linear, twisted petals. Woods, meadows, and prairies. 



2. CALYPSO, Salisb. Sep. and pet. subequal, ascending. Lip large, 

 inflated, with 2 spurs dependent beneath near the apex. Column petaloid. 

 Pollinia 4. it Scape 1-leafed at base, 1-flwd. above, arising from a corm. 



C. borealip Salisb. Old mossy woods, Vt., N. Y., W. to Oregon ! Scape 68' ; leaf 

 broad-ovate, 12' ; flowers purple and yellow, H'. Rare eastward. May. 



3. ORCHIS, L. Sepals and pet. similar, some of them ascending and 

 arching over the column. Lip turned downward, produced at base into a 

 spur which is free from the twisted ovary. Sta. 1, anth. 2-celled, a pollen- 

 mass in each cell. Fls. racemed on the stem or scape. June August 

 (Includes Habenaria, Gymnadenia, and Platanthera.) 



* Leaves only 2, a ovate, nearly as long as scape. Flowers rose- white No. 1 



a roundish, the scape much longer. Flowers greenish.. .Nos. , 3 



* Leaf only 1. Flowers greenish-white. Lip entire or 3-l --ed Nos. 4, 5 



* Leaves several, clothing the stem more or less.. .(&) 



6 Lip undivided, c entire, white or greenish Noe. 6, 7 



