HOUSE, THE GENUS IPOMCEA 
245 
long; peduncles 1.5-2 cm. long, 1- to 5-flowered, bracts minute; pedicels 1 cm. long; 
sepals unequal, obtuse, ovate-oblong, outer ones 3-5 mm. long, inner 5-7 mm. long; 
corolla white, funnelform, about 3 cm. long and as broad; capsules ovoid, 8-9 mm. 
long, 2-celled. 
Mexico: Jalisco; Between San Sebastian and Las Palmas, 3000-2500 ft. 
alt. E. W . Nelson 4129, Mar. 30, 1897 (type — N, G). 
135. Ipomoea callida House, Muhlenbergia 3: 42. pi. 3, Fig. b. 1907. 
Perennial, woody below; leaf-blades 6-12 cm. long, 4-6 cm. broad at the base, 
glabrous and glossy above, paler beneath; peduncles 5-10 cm. long, 5- to 10-flowered 
in a rather dense cyme; sepals 5 mm. long in the outer to 10 mm. long in the inner, 
rounded; corolla purple, 4.5-5 cm. long. 
Type locality: Near Puerto Sierra, Honduras. 
Distribution : Known only from the type locality. 
Specimens examined: Percy Wilson 534, 1903 (type — Y). 
136. Ipomcea buchii Urban, Symb. Ant. 3: 356. 1903. 
Young stems minutely but sparingly pilose; leaf-blades 3-lobed or parted, 3.5-5 
cm. long, 4-6 cm. broad, middle lobe ovate-elliptical, obtuse; peduncles 1-flowered, 
6-12 cm. long; sepals pale-green, outer ones oval, 4.5 mm. long, rounded, inner 
6 mm. long, subtruncate at apex; corolla white, 4-4.5 cm. long. 
Type locality: Near Petite Coupe, mountains of Hayti, alt. 250 m. 
Distribution: Mountains of Hayti. 
137. Ipomoea rhomboidea sp. nov. 
A slender, twining vine from a perennial root; stems angled, minutely canescent; 
leaf-blades ovate, 3-lobed, shallowly cordate, 8-12 cm. long and as broad, lobes 
contracted below, suborbicular, obtuse, thin and submembranaceous, reticulate- 
veined, minutely pubescent; petioles 6-10 cm. long, very slender; peduncles 4-6 
cm. long, 1- to 3-flowered; pedicels 1-3 cm. long, becoming 5 cm. long in fruit; sepals 
very unequal, outer oblong, obtuse, subcanescent, 7-9 mm. long, inner ones broader, 
rounded, 10-13 mm. long; corolla white, tinged with purple-mauve below, funnel- 
form, constricted within the calyx, 6-7 cm. long, limb 5-lobed, 5-6 cm. broad, the 
plicae ending in minute cusps at the margin; capsules ovoid. 
Mexico: Sinaloa; Topolobampo, Palmer 227, Sept. 1897 (type — 315548 
