CYPRIPEDIUM CXL. ORCHIDACE^E. 637 



and of a dark green, reticulated above with white veins. They are ovate, 1 2- 

 in length, contracted at base into winged petioles scarcely half as long. Scape 

 erect, 6 12' high. Flowers white, in a terminal, oblong, cylindric spike. lap 

 roundish, saccate, inflated. July, Aug. 



0. repens. (G. repens. Br.} Lv$. less conspicuously reticulated ; spike some- 

 what unilateral. A reduced form of G. pubescens, certainly unworthy of being 

 exalted into a species. Stem 6 8' high. Flowers in one row, which is more 

 or less spiral. 



13. LISTER A. Brown. 



Named for Dr. Martin Lister, an English naturalist, died 171L 



Lip 2-lobed, pendant, with no callous "processes; column wingless, 

 minute ; anther fixed by its base, persistent. 



1. L. CORDATA. Br. (Ophris. MX.} Tway-blade. 



St. 2-leaved, the leaves opposite, deltoid-subcordate, acute ; roc. few-flow- 

 ered; lip linear, 2-toothed at base, deeply bifid, with divaricate and acute seg- 

 ments ; column very short. Root fibrous. Stem 4 8' high, furrowed. Leaves 

 i f ' diam., sessile, about half way up the stem. Flowers minute, greenish- 

 purple, 10 15, in a short raceme. A delicate little plant, in woods and sphag- 

 nous swamps, among mountains, &c., N. States and Brit. Am. July, Aug. 



2. L. coNVALLARiolDEs. Nutt. (Epipactis. Sw.} 



St. 2-leaved, the leaves opposite, roundish-ovate ; roc. few-flowered, loose, 

 pubescent ; sep. ovate-lanceolate ; lip oblong, 2-toothed at base, with 2 roundish 

 lobes and an intermediate minute one at the apex ; column elongated. Car. to 

 Arc. Am, Root fibrous. Stem very slender, 5 10' high, sheathed with a lew 

 bracts bearing the 2 leaves near the middle. Leaves near an inch long, f as 

 wide. Flowers small, the broad, obcordate lip twice as long as the sepals. May. 



SECTION 4. Lateral anthers fertile ; the middle one sterile and pe- 



taloid. 



14. CYPRIPEDIUM. 



Gr. KtJjrptj, Venus, xo$ioi>, a slipper; from the slipper-like form of the lip. 



The 2 lower sepals united into 1 segment, or rarely, distinct ; lip 

 ventricose, inflated, saccate, obtuse ; column terminated by a peta- 

 loid lobe (barren stamen). Fls. large, very showy, distinguished for 

 the large, inflated lower petal or lip. 



l.C. CANDIDUM. Willd. White-flowered Ladies' -slipper. 

 St. leafy ; Ivs. oblong-lanceolate ; fl. terminal, solitary ; sep. elliptic- 

 lanceolate, acuminate, lower scarcely bifid at apex;.^. lance-linear, longe 

 than the compressed lip ; lobe of the style lanceolate, rather obtuse. Bordei 

 of woods, prairies, Penn. to Ind. Plummer! Resembles the next in foliage, bis 

 remarkably distinguished by the white flower. Stem about If high, simple 

 Leaves 3 6' by 1 If, sheathing the stem, acute. Ovary pedicellate. Lip 1 

 in length. Petals and sepals nearly 2'. May. 



2. C. ACAULE. Ait. (C. humile. Sw. 7) Acaulescent Ladies' -slipper. 

 Scape leafless, Uflowered ; Ivs. 2, radical, elliptic-oblong, rather acute ; 



lobe of the column roundish-rhomboidal, acuminate, deflexed ; pet. lanceolate ; 

 lip longer than the petals, cleft before. A beautiful plant, in dark woods, Car. 

 to Arc. Am. Leaves large, plaited and downy. Scape 10 14' high, with a 

 single lanceolate bract at the base of the large, solitary flower. Sepals $' kng, 

 the two lower completely united into a broad lanceolate one beneath the lip. 

 Petals lateral, wavy. Lip 2' by 1', purple, forming the most showy part of the 

 flower. May, June. 



3. C. PARViFLdRUM. Salisb. Yellow Ladies 1 -slipper. 



St. Leafy ; Ivs. broad-lanceolate, acuminate ; lobe of the column triangular- 

 oblong, acute ; sep. ovate, oblong, acuminate ; pet. long, linear, contorted ; lip 

 shorter than the petals, compressed. Woods and meado\ys, Newf. to Car. 

 Stems usually several from the same root, about a foot high. Leaves 3 6 



