324 PROCEEDINGS OF THE AMERICAN ACADEMY, 
beneath, 2-3 inches in length, about the same breadth: flowers of 
the staminate plant in slender compound racemes; the latter scarcely 
pedunculate, either solitary in the axils or borne at the successive 
nodes of the leafless ends of the stem; branches of the racemes numer- 
ous, about 5-flowered, the uppermost reduced and fewer-flowered : 
pedicels 4 line long: bracts lance-linear, acuminate: perianth cam- 
panulate, pale yellow; segments obovate, rounded at the ends, 1} 
lines in length: stamens 3; filaments slender ; rudiments none : fertile 
racemes axillary, short-peduncled, in fruit 2-3 inches in length: fruit 
suborbicular, retuse, 33 lines in diameter (immature). — Collected 
‘on grassy slopes of barranca near Guadalajara, 7 September, 1893 
(no. 4526 
D. uirsuTicavLis. Pubescent-hirsute throughout with crisped 
white hairs: stem elongated, twining: leaves deltoid-ovate, acu- 
minate, entire, cordate with an open sinus, about 9-nerved, 2-3 
inches long, nearly as broad; petioles 8 lines in length: racemes of 
the staminate plant slender, simple, about 1} inches in length upo® 
peduncles perhaps half as long, solitary in the axils or borne at the 
successive nodes of the nearly leafless ends of the stems ; pedicels 
but 4-} line in length: perianth campanulate, a line in diameter; 
segments ovate-oblong, obtuse: stamens only 3, filaments short and 
straight: inflorescences of the female plant axillary, solitary, in fruit 
1} inches in length, 3 inch in diameter: fruit stramineous, broadly 
elliptic, smooth, 4} lines in length, 34 lines in breadth, reflexed and 
very densely imbricated. — Collected under dry ledges, barranca of 
Tequila, 14 October, 1893 (no. 4572). 
D. pLumirera. Glabrous: stems twining: leaves thin, ovate acu: 
minate, entire, cordate with a broad sinus, 7—11-veined, slightly 
paler beneath, 24-3 inches long, 2 inches broad: staminate flowers 
yellowish green, 24 lines in diameter, borne in long slender feathery 
panicles ; the latter geminate at the axils, 4 inches in length, y ¢ 
in diameter; the numerous short lateral branches about 3-flowered 5 
pedicels 3-1 line long, very slender: bracts lance-linear, acuminate, 
1 line in length: segments of the perianth oblong-lanceolate, obtuse: 
fertile stamens 3, slender, not at all rigid or divaricate, alternating 
with 3 rudiments: racemes of the fruiting plant short-peduncled, 
densely flowered, 2 inches in length: fruit (scarcely mature) broadly 
elliptic, 4 lines long, reflexed, imbricated. — Collected under cliffs, 
barranca of Tequila, 14 October, 1893 (no. 4530). 
D. mititaris. <A slender vine 2-4 feet in length: stem smooth, 
from a small tuber: leaves rather distant, 3-lebed and halberd-shape’s 
