188 
ANNALS NEW YORK ACADEMY OF SCIENCES 
Mexico: Chihuahua, between Colonia Garcia and Pratt’s ranch, below 
Pacheco, E. W. Nelson 6276, 1899 (type, sheet No. 359993 — N). 
9. Ipomoea lenis sp. nov. 
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-lanceo¬ 
late, obtuse, 5-6 mm. long, the outer ones silvery-pubescent; corolla funnelform, 5-6 
cm. long, blue, glabrous, the limb 4-5 cm. broad, 5-lobed. 
Mexico: Zacatecas; Near Berriozobal, E. W. Nelson 3889, July 8, 
1896 (type, sheet No. 266883 —N, dupl. G). 
10. Ipomoea leptophylla Torr. in Frem. Rep. 95. 1845.— Emory, 
Rep. pi. 11. — Morris in Plant World 7: pis. 5 & 6. — Small, FI. 
Southeastern U. S. 964. 1903.— Roth. Rot. Wheeler 205. 1878. 
Convolvulus Caddoensis Buckley in Proc. Phila. Acad. 1862: 6. 1862. 
Type locality: Upper Platte. 
Distribution: Dry soil, plains of South Dakota and southeastern 
Montana to Texas and New Mexico. 
3. Arborescentes. Erect, woody, arborescent or shrubby perennials, 
often several m. tall; leaf-blades oblong-ovate to narrowly or triangular- 
ovate, rounded, truncate or subcordate, rarely subsagittate at the base; 
sepals coriaceous, obtuse; corolla white, rarely pink or purple; capsules 
narrowly ovoid, or oblong; the coma of hairs on the seeds very long. ( Ipo¬ 
moea Sect. Orthipomoea, § Arborescentes, Choisy in DC. Prodr. 9: 358. 1845. 
Seeds with black coma on all surfaces. 
Twigs and leaves puberulent or glabrous; leaf-blades 
cordate-sagittate or truncate. 
Leaf-blades oblong, acuminate. 11. 
Leaf-blades ovate, short-acuminate. 12. 
Twigs and leaves densely canescent; leaf-blades ovate- 
cordate. 13. 
Seeds with white coma only on the dorsal angles. 
Corolla and sepal densely woolly without. 14. 
Corolla and sepals pubescent or glabrous, not woolly. 
Foliage more or less densely pubescent; veins promi¬ 
nent beneath on the blades. 
Leaf-blades ovate, cordate. 15. 
Leaf-blades, oblong, rounded at the base. 16. 
I. fistulosa. 
I. glabriuscula. 
I. nicaraguensis. 
I. murucoides. 
I. arborescens. 
I. cuernavacensis. 
