36 PROCEEDINGS OF THE AMERICAN ACADEMY. 
altitude about 10,000 feet, August, 1894, nos. 5614, 5614 a, and by E. 
W. Nelson, in the same locality, no. 1140. 
Microstylis streptopetala. Slender, 6 to 18 inches high, 1- 
leaved: bulb oval, half inch in diameter; sheaths 2, closely surrounding 
the base of the stem, obtuse: leaf elliptic-oblong, cuneate at the amplexi- 
caul base, acutish or obtuse at the apex, 14 to 3 inches long, 4 to 8 lines 
broad: naked and angled peduncle about equalling the stem (2 to 4 
inches in length): spicate inflorescence strict, slender, 2 to 8 inches long, 
2 to 3 lines in thickness, very densely flowered above but looser below: 
bracts very short ovate-deltoid, obtusish: flowers sessile: sepals 3-nerved, 
green, oblong, obtuse, the upper somewhat falcately incurved, 1} lines 
long, green; lower 2 lines long: lateral petals linear, spirally coiled or 
twisted, greenish white; labellum deltoid, strongly auriculate, minutely 
3-toothed at the apex, half as long as the upper sepals, in dried state 
nearly black ; margins somewhat thickened and slightly incurved ; auricles 
oblong and obtuse.— Collected in flower by C. G. Pringle on dry pine 
ridges, Sierra de San Felipe, Oaxaca, at 9,000 to 10,000 feet altitude, 
30 July, 1894, no. 4808. Most nearly related to MW. montana, Roth, but 
with very different lip. 
oradendron Forestierze. Glabrous throughout: branches 
terete, olive-green; branchlets ancipital: leaves narrowly oblong, with 
rounded apex and cuneately narrowed base, sessile, 1-nerved, or very 
obscurely 3-nerved, yellowish green, inch to inch and a half long, 1} t 
24 lines wide: inflorescences of 9 plant axillary, solitary, opposite, 
moniliform, 5 to 9 lines in length, flowers in 1 to 4 globular 10-12- 
flowered clusters, becoming deeply imbedded in the substance of the 
nodular rhachis; the clusters 24 lines in diameter, tawny in color ; 
the intervening necks 1 to 14 lines long, about half enveloped in a loose 
sheath; the margins of the sockets holding the flowers finely ciliolate : 
divisions of the perianth 3 (rarely 4), deltoid, the free portion not 4 
third of a line in length. — Collected by C. G. Pringle on hills between 
Tehuacan and Esperanza, Puebla, altitude 6,000 feet, 23 December, 
1895, no. 6290. A species parasitic on Forestiera, and apparently most 
nearly related to P. brachystachyum, Oliv., which, however, is tomen- 
tulose on the branchlets, has simple not moniliform inflorescences, and 
larger more distinctly veined leaves. 
Euphorbia Luciismithii. Tall branching tomentulose glaucous 
shrub, 10 to 15 feet in height: branches subterete, striate : leaves vertl- 
cillate, 2-5-nate, elliptical, obtuse at both ends or subacute at the base, 
glabrous or glabrate above, paler and soft grayish-tomentulose beneath, 
