HOUSE, THE GENUS IPOMCEA 187 



5. Ipomoea jaliscana House, Muhlenbergia 3: 39. 1907. 



/pomoea stons var. Mrsuto Robinson, Proc. Am. Acad. 29 : 319. 1894. 



Differs from /. stans by its more conspicuously hirsute stems and leaves, the 

 sessile leaf-blades which are relatively broader and more deeply lobed at the base; 

 sepals suborbicular, 6-8 mm. long. 



Type locality: Rio Blanco, Jalisco. 

 Distribution : Jalisco . 



Specimens examined: Palmer 324, 1886 (type — G, N, C). Pringle 

 4488, 1893 (G, N). 



I 6. Ipomoea durangensis sp. nov. 



Stems erect, 50 cm. tall, finely sericeous-pubescent, densely so above, silvery on 

 young parts; leaf-blades elUptical-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, plicEe pubescent without, the limb 5-6 cm. broad; sepals 

 enlarged in fruit with subspatulate tips (not accrescent); capsules globose-ovoid, 

 subacute, 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 866, 1896 (N, Y, G). 



^ 7. Ipomoea pringlei A. Gray, Proc. Am. Acad. 22 : 307. 1887. 



f Ipomcea sescossiana Baillon, in Bull. Soc. Linn. Par. 1: 385. 1883. 



Tall, erect and rigid; leaf-blades pinnately divided into 5-8 linear or filiform 

 segments, 15-30 mm. long; peduncles stout, 1-flowered, as long as the leaves; sepals 

 oblong, rounded, 7-8 mm. long; coroUa blue or purple, 6-7 cm. long; capsules ovoid, 

 12-14 mm. high on reflexed pedicels, 2-celled; seeds tomentulose with an incon- 

 spicuous coma on the dorsal angles. 



Type locality: Chihuahua. 



Distribution : Hilly regions of northern Mexico. 



Specimens examined: Chihuahua, Pringle 782, 1886 (type — G, N, 

 Y). 579, 1885 (G). E. W. Nelson 6276, 1899 (N). Durango, E. W. 

 Nelson 4729, 1898 (N). 



8. Ipomoea ancisa sp. nov. 



ResembUng /. Pringlei; leaf-blades 5-10 cm. long, the segments filiform, 2-5 

 cm. long, .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- 

 fimnelform, white, 7-8 cm. long, the limb 6-7 cm. broad. 



