Cypripedium. CXL. ORCHIDACEiE. 537 



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, G — 12' high. Flowers white, in a terminal, oblong, cylindric spike. Lip 

 roundish, saccate, inflated. July, Aug. 



/?. repens. (G. repens. Br.) L/vs. less conspicuously reticulated ; spike some- 

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

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

 or less spiral. 



13. LISTfiRA. Brown. 



Named for Dr. Martin Lister, an English naturalist, died 1711. 



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-leavcd, the leaves opposite, deltoid-subcordate, acute ; rac. 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 

 X — I' 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. coNVALLARioiDEs. Nutt. (Epipactis. Stv.) 



St. 2-leaved, the leaves opposite, roundish-ovate ; rac. 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 few 

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



Gt. KvTTjOfj, Venus, iro^iovy 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. largc^ very showy^ distinguished for 

 the large.) inflated loiver petal or lip. 



1. C. CANDiDUM. Willd. W/iite-flowercd Ladies' -di]rpcr. 



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

 lanceolate, acuminate, lower scarcely bifid at apex ; pet. lance-linear, longer 

 than the comprer^scd lip; hhc o\' \\\q style lanceolate, rather obtu.se. — Borders 

 of woods, prairies, Ponn. to Ind. Pliumncr! Resembles the next in foliage, but 

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

 Leaves 3 — 6' by 1 — IJ', sheathing the stem, acute. Ovary pedicellate. Lip V 

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



2. C. ACAULE. Ait. (C. humile. Sw. 1) Acauksccnt Ladies' -slipper. 

 Scape leafless, 1-floAvered ; Ivs. 2, radical, elliptic-oblong, rather acute ; 



lobe of the column roundish-rhomboidal, acuminate, Ac^exeA] pet. lanceolatt- ; 

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

 to Arc. Am. Leaves large, plaited and downy. Scape 10 — 14' liigh, with ;i 

 single lanceolate bract at the base of the large, .'solitary flower. Sepals J' Ion;', 

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

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

 flower. May, June. 



3. C. parvifi,6ri;.m. Salisb. Ycllmo Ladies' -slipper. 



St. Leaty; hs. broad-lanceolate, acuminate; lot)e of the column trian^ular- 

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

 shorter than the petals, comprcs.sed. — Woods and meadows, Newf. to Car. 

 Stems usually several frcmi the same root, about a foot high. Leaves 3 — G 



