ROBINSON AND GREENMAN. — MEXICAN PLANTS. 35 
silvery diaphanous brown-veined bracts: sepals finely pubescent on the 
outer surface; the lateral sepals linear-oblong, 6 lines in length, obtuse, 
3-nerved, not fleshy ; the dorsal one ovate-lanceolate, obtusish, about the 
same length: petals linear-oblong, obtusish, 3-nerved, about equalling 
the sepals; labellum long-unguiculate; lamina oblong, 5 lines in length 
(about equalling or slightly exceeding the claw), 3} lines broad, with a 
median lance-shaped callous thickening just above the thickish claw; 
the latter involute on the margin and somewhat sulcate above. — Col- 
lected by C. G. Pringle, on hills above San Felipe, Oaxaca, altitude 
6,000 feet, 31 December, 1894, no. 6101. 
Cranichis thysanochila. Glabrous throughout, 6 to 8 inches 
high: roots several, elongated, thick, tuberiform, obtuse, covered with 
fine short rootlets: leaves basal, ovate, acute, thin, smooth, 1} to 3 
inches long, half to two thirds as broad, subsessile; the contracted base 
membranous, amplexicaul: stem slender, flexuous, bearing about 5 lan- 
ceolate attenuate sheathing green bracts: spike 2 to 4 inches in length, 
only moderately dense: floral bracts ovate-lanceolate, sharply acuminate, 
green, 3 lines in length, about equalling the ovary: flowers spreading, 
nearly half inch in length: floral envelopes white ; sepals oblong, obtuse, 
1-nerved, subequal, about 2 lines in length; lateral petals broadly spatu- 
late or narrowly obovate, obtuse, 1-nerved, about equalling the sepals in 
length ; lip superior, obovate, cuneate, short-clawed, biauriculate at the 
base, terminated at the apex by an emarginate and fimbriated appendage ; 
the inner surface longitudinally somewhat 2-crested. — Collected by C. 
G. Pringle, on calcareous banks, Las Hoyas Cafion, Oaxaca, altitude 
4,500 feet, 2 November, 1894, no. 6023. This species differs from 
others of the genus in the fringed apex of the lip. 
Microstylis platyglossa. Erect, a foot high, glabrous, 1-leaved: 
bulb three fourths inch in diameter: sheath subsolitary, short, obtuse : 
leaf oval, amplexicaul at the subcordate base and rounded or very obtuse 
at the apex, 1} to 2} inches long, 15 to 18 lines broad: peduncles about 
2 inches long; racemes 6 to 8 inches long, bracts ovate, acute, a third to 
half as long as the slender pedicels, these nearly horizontal, 14 lines 
long: flower purple (the labellum sometimes lighter colored), inverted 
by the torsion of the pedicels, bringing the labellum downward : sepals 
oblong, obtuse, 1-nerved, about a line long, the upper odd one erect, the 
lower pair reflexed: lateral petals linear, reflexed; labellum broadly 
deltoid, one third broader than long, obtuse, about a line in length, dark 
Purple or yellow (both colors sometimes occurring on the same specimen). 
— Collected by C. G. Pringle, on the Sierra de San Felipe, Oaxaca, 
