CYPRIPEDIUM. CXL. ORCHIDACEZ. : 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, 6—12’ high. Flowers white, in a terminal, oblong, cylindric spike. Lip 
toundish, saceate, inflated. July, Aug. ; 
8. repens. (G. repens. Br.) Lvs. 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. LISTERA. 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. corpata. Br. (Ophris. Mz.) Tway-blade. 
St. 2-leaved, 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 
3—3’ diam., sessile, about half way up the stem. Flowers minute, greenish- 
purple, 10—15, ina short raceme. A delicate little — in woods and sphag- 
nous swamps, among mountains, &c., N. States and Brit. Am. July, Aug. 
2. L. convaLLaRiOipes. Nutt. (Epipactis. Sw.) 
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, 3 as 
wide. Flowers small, the broad, obcordate lip twice as long asthe sepals. May. 
Section 4, Lateral anthers fertile; the middle one sterile and pe- 
taloid. 
(14. CYPRIPEDIUM. 
Gr. Kozots, Venus, todtov, aslipper; 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).—Fs. large, very showy, distinguished for 
the large, inflated lower petal or lip. 
1. C. canpipum. Willd. White-flowered Ladies’-slipper. 
St. leafy; lvs. oblong-lanceolate; fl. terminal, solitary; sep. elliptic- 
lanceolate, acuminate, lower scarcely bifid at apex; pet. lance-linear, longer 
than the compressed lip; lube of the style lanceolate, rather obtuse.—Borders 
of woods, prairies, Penn. to Ind. Plummer! Resembles the next in foliage, but 
remarkably distinguished by the white flower. Stem about 1f high, simple. 
Leaves 3—6’ by 1—1}’, sheathing the stem, acute. Ovary pedicellate. Lip 1’ 
in length. Petals and sepals nearly 2’. May. 
2. C. acaute. Ait. (C. humile. Sw.?) Acaulescent Ladies’-slipper. 
Scape leafless, 1-flowered; Ivs. 2, radical, elliptic-oblong, rather acute ; 
lobe of the column roundish-rhomboidal, acuminate, deflexed; pet. lanceolate; 
lip \onger 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 3’ long, 
the two lower completely united into a broad lanéeolate one beneath the lip. 
Petals lateral, wavy. Lip 2’ by 1’, purple, forming the most showy part of the 
flower. May, June. 
3. C. pARVIFLORUM. Salisb. Yellow Ladies’-slipper. 
St. Leafy ; lvs. 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 meadows, Newf. to Car. 
Stems usually several from the same root, about a foot high. Leaves 36 
