HOUSE, THE GENUS IPOMCEA 185 



1. Argyrophyllse, Plants silvery-pubescent and more or less tomentose;' 

 sepals acuminate, lanceolate; corolla white. (Ipomoea § Argywphylloe 

 Baker & Rendle, in T. Dyer, Fl. Trop. Afr. 4^: 135. 1905.) 



One species ia North America. 1. /. ciervensis. 



1, Ipomcea ciervensis Painter; House, Bot. Gaz. 43:408. 1907. 



Shrubby below, 30-60 cm. high, densely silvery-pubescent throughout except 

 the corolla; leaf-blades sessile or nearly so, oblong-lanceolate, acute or obtuse and 

 somewhat 3-lobed, 4-6 cm. long; peduncles 1 cm. long; bracts linear-spatulate or 

 subfoliaceous; sepals ovate-lanceolate, attenuate, about 15 mm. long; corolla 

 white, about 6 cm. long, pubescent without in bud and strigulose on the plicae when 

 expanded. 



Type locality: Hacienda Ciervo, Queretaro, Mexico. 

 Distribution: Known only from the t}^e locality. 

 Specimens examined: Rose, Painter & Rose 9660, 1905 (t}^e — N, Y). 

 Altamirano 1557, 1905 (N). 



2. Leptophyllse. Foliage pubescent or glabrous, not silvery; leaf- 

 blades entire (divided in /. Pringlei & I. ancisa); sepals coriaceous, ovate 

 to ovate-laceolate, obtuse; corolla large, purple or white. (IpomoBa § 

 suffruticoscB Choisy, in DC. Prodr. 9: 353. 1845.) 



Corolla white or cream-colored. 



Sericeous-pubescent; outer sepals much shorter than the 



inner. 

 Glabrous or nearly so. 



Leaf-blades linear-lanceolate to oblong-lanceolate ; sepals 



subequal. 

 Leaf-blades pinnately divided, 5-10 cm. long, sepals very 

 unequal. 

 Corolla purple, lilac or pink. 

 Plant pubescent or hirsute. 

 Leaf-blades subsessile, hastately toothed at the base. 

 Sparingly pubescent; sepals 10-15 mm. long. 

 Densely pubescent; sepals suborbicular, 8-10 mm. 

 long. 

 Leaf-blades not toothed at the base. 



Leaves 2 cm. long or more; sepals acute, 8-13 mm. 



long. 

 Leaves less than 1 cm. long, woolly-white; sepals obtuse, 

 5-6 mm. long. 

 Plant glabrous or nearly so. 

 Leaf-blades pinnately divided, 2-4 cm. long. 

 Leaf-blades entire, linear-lanceolate. 



