HOUSE, THE GENUS 1P0MCEA 
207 
Sepals not tentacular. 
Corolla glabrous, tube 1-1.5 cm. thick. 
Sepals acute or subobtuse; plant more or less 
densely pubescent. 
Sepals long-acuminate, plant sparingly pubes¬ 
52. 
I. longipedunculata. 
cent. 
53. 
I. orizdbensis. 
Corolla pubescent without, the tube 1.5-2.5 cm. 
thick. 
Sepals about 12 mm. long; leaf-blades stri- 
gose-pubescent beneath. 
Sepals 22-30 mm. long; leaf-blades silvery- 
54. 
1. tyrianthina. 
pubescent beneath. 
55. 
/. venusta. 
47. Ipomoea iostemma sp. nov. 
Slender, annual, twining, herbaceous, 1-2 m. long or less; stems very "slender, 
sparingly hirsute; leaf-blades ovate and entire to hastate-ovate or 3-lobed, cordate, 
acuminate, 2-5 cm. long, 1.5-4 cm. wide, pubescent with scattered, inconspicuous 
hispidulous hairs, lateral lobes acute and short, middle lobe elongated; petioles 
shorter than the blades; peduncles shorter than the petioles and stouter, usually 
1-flowered; bracts linear, 8-10 mm. long; sepals linear, 10-12 mm. Ion/* and 1-2 mm. 
broad at the base, the lax tips caudate-acuminate, glabrous; corolla 2-3 cm. long, 
the violet-purple limb shading into white below. 
Costa Rica: Nicoya, Tonduz 13680, Jan. 1900."(type — Y). Mexico; 
Ixtapa, Jalisco, E. W. Nelson 414E 1897 (N). 
48. Ipomoea variabilis (Schlecht. & Cham.) Choisy in DC. Prodr. 
9 : 383. 1845. 
Convolvulus variabilis Schlecht. & Cham, in Linnaea 5: 116. 1830.— Hallier f. 
Bull. Herb. Boiss. 7: 411. 1899. 
A twining annual, glabrous except for the calyx; leaf-blades ovate-lanceolate, 
acute or acuminate, 5-8 cm. long, entire or usually cordate-hastate, the basal lobes 
laterally acute; peduncles shorter than the petioles, hirsute at the base, 1-2 cm. 
long, 3- to 5-flowered; bracts linear-lanceolate; sepals broadly lanceolate or ovate- 
lanceolate, 12-15 cm. long, hirsute with spreading hairs at the base, glabrous above; 
corolla blue (or purple), 5-6 cm. long, the limb as broad with 5, rounded lobes; 
tube white, plicae purple or rose; capsules 8-10 mm. thick; seeds smooth. 
Type locality: Vera Cruz. 
Distribution: Mexico. 
Specimens examined: Vera Cruz, Muller 119, 1853 (C, Y). (Hallier, 
1. c. cites Seler 2532, 3410, from Guatemala.) 
