998 D D. House. d 
LO. H. D. House, /pomoea genus speciebus novis 
Americae septentrionalis auctum. 
(Ex: Ann. N. Y. Ac. Sei, XVIII [1908], pp. 181—263.)!) 
1. Ipomoea durangensis J. D. House, l. c., p. 187. | 
Stems erect, 50 cm tall, finely sericeous-pubescent, densely so above, 
silvery on young parts; leaf-blades elliptical-oblong, 2—3 cm long, 5— 
15 mm wide, obtuse; peduncles 1 cm long or less, 1-flowered; sepals | 
subequal, lanceolate, acute, 8—13 mm long, densely silky-pubescent; | 
corolla slender funnelform, 6—7 cm long, violet-purple with a white tube, / 
plicae pubescent. without, the limb 5—6 cm broad; sepals enlarged in 
fruit with subspatulate tips (not accrescent); capsules globose-ovoid, sub- 
acute, 15 mm high, thick-walled, 2-celled; seeds minutely pubescent with | 
a short coma of hairs on the dorsal angles. | 
Mexico: Durango, E. W. Nelson 4639, 1898 (type, sheet no. 332692 | 
— N, dupl. G), 4664, 1898 (N — 332718, G) Palmer 366, 1896 | 
(N, Y, G). | | 
2. Ipomoea ancisa J. D. House, l. c., p. 187. 
Resembling J. Pringlei; leaf-blades 5—10 cm long, the segments 
filiform, 2—5 cm long, 0,5 —1,5 mm wide; peduncles very stout, 6—11 cm 
long, 1-flowered; sepals very unequal, orbicular-ovate, obtuse, with 
scarious margins; corolla slender-funnelform, white, 7—8 cm long, the 
limb 6—7 cm broad. 
Mexico: Chihuahua, between Colonia Garcia and Pratt’s ranch, 
below Pacheco, E. W. Nelson 6276, 1899 (type, sheet no. 359993 — N). 
3. Ipomoea lenis J. D. House, 1. c., p. 188. 
A dwarf, perennial, shrubby plant with thickened, woody base; stems 
erect, 10—30 cm tall, densely woolly or silky pubescent with white hairs; 
leaf-blades sessile, oblong, obtuse at both ends, 6—10 mm long, 2—4 mm 
broad; flowers solitary in the upper axils and often crowded; peduncles | 
5—8 mm long; sepals equal, ovate-lanceolate, obtuse, 5—6 mm long, the 
outer ones silvery-pubescent; corolla funnelform, 5—6 cm long, blue, 
glabrous, the limb 4—5 em broad, 5-lobed. 
Mexico: Zacatecas; Near Berriozobal, E. W. Nelson 3889, July 8. 
1896 (type, sheet no. 266883 — N, dupl. G). 
4. Ipomoea invicta J. D. House, Le p. 193. 
A stout, woody twining vine; stems, petioles and peduncles minutely 
pubescent: leaf-blades ovate, cordate, acute or abruptly acuminate, 
8—14 cm long, glabrous above, pubescent beneath, principal veins about 
6 pairs; petioles shorter than the blades; peduncles 6—10 cm long, 
1) Die Abkürzungen bei den aufgeführten Standorten bedeuten: (N): Nat. 
Herb. Washington. — (Y): N. Y. Bot. Gard. — (C): Col. Univ. Herb. N. Y. — Í 
(G): Gray Herb. Harvard Univ. — (M): Mus. nac. Mexic. — (J): Dep. Agric. | 
Jamaica. | | 
-y 
