HOUSE, THE GENUS IPOM(EA 
257 
Type locality: Oak woods, Juquila, Mexico (Galeotti 1375). Not 
known by any recent collections. 
165. Xpomoea curtissii sp. nov. 
Slender, twining, 1-2 m. long, finely and densely pubescent or canescent; leaf- 
blades ovate, entire, cordate, acute, 2-5 cm. long and as broad, or broader, glabrous 
or nearly so; petioles usually shorter; peduncles rarely longer than the petioles, 
1- to 5-flowered; pedicels 15-20 mm. long and slightly thickened, recurved in fruit; 
sepals subequal, greenish, puberulent, scarious-margined, ovate, acute, 5-6 mm. 
long; corolla yellowish with a magenta base, funnelform, about 4 cm. long, the sub¬ 
entire limb as broad; capsules ovoid, acute, about 12 mm. long, 2-celled; seeds 
glabrous. 
Cuba: Havana, Curtiss 562 ,1904 (type — Y, G). Panama; Santa Rita 
Trail, Cowell 166, 1905 (Y). 
Apparently differing from 7. obscura Ker. only by its larger sepals and 
larger corolla of a more decided yellow. 
166. Xpomoea robinsonii sp. nov. 
A slender, glabrous, twining vine with zig-zag leafy branches; leaf-blades ellipti¬ 
cal-oblong, rounded at base, apex obtuse or subacute, 6-8 cm. long, 2-4.5 cm. broad, 
punctate; petioles 1-2 cm. long; peduncles 1-flowered, less than 2 cm. long, the 
two large yellowish-green bracts elliptical-lanceolate and acute, tapering to the 
base; sepals orbicular-ovate, rounded at apex, 7-9 mm. long; corolla slender funnel- 
form, 6-8 cm. long, white, the limb 3.5-4 cm. broad, with 5 rounded lobes; stamens 
nearly as long as the corolla; capsules ovoid, 1 cm. long, apiculate. 
Mexico: Morelos; Lava beds near Cuernavaca, Pringle 7338, 1896 
(type — G).. 
Named in honor of Dr. B. L. Robinson, curator of the Gray Herbarium 
of Harvard University. 
167. Ipomoea dimorphophylla Greenm. in Proc. Am. Acad. 33: 482. 
1898. 
Slender, perennial below, more or less pubescent with fine hairs; leaf-blades 
ovate-oblong, 4-10 cm. long, 3-8 cm. broad, shallowly cordate, acuminate, entire or 
variously 3-lobed, more or less pubescent beneath; peduncles shorter than the peti¬ 
oles, 1-several flowered; sepals thick and coriaceous, obtuse, 6-7 mm. long; corolla 
white, 6-8 cm. long. 
Type locality: Near Cuernavaca, Morelos, Mexico. 
Distribution: Morelos and Oaxaca, Mexico. 
Specimens examined: Cuernavaca, Pringle 6658, 1897 (type — G, N, 
