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 U29, Mar. 30, 1897 (type — N, G). 



/ 135. Ipomcea callida House, Muhlenbergia 3: 42. p/. 5, Fig. 6. 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. Ipomcea 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, Pa/m^r ^^7, Sept. 1897 (type — 315548 



-N). 



