198 



ANNALS NEW YORK ACADEMY OF SCIENCES 



Leaf-blades canescent, silvery or eilky-white beneath at 

 least when young. 



Sepals pilose; leaf-blades sUvery-canescent beneath. 

 Sepals glabrous or nearly so; leaf-blades silky-pubes- 

 cent, glabrate above with age. 

 Leaf-blades hispid-pubescent to glabrate. 



Tips of sepals caudate-spatulate, obtuse; corolla white. 

 Tips of sepals caudate-acuminate; corolla blue. 

 Foliage pubescent or hirsute. 



Sepals glabrous; 25-30 mm. long; leaf-blades 



hastately 5-7 lobed and cordate-hastate. 

 Sepals pubescent or hispid. 



Leaf-blades entire, silky-pubescent. 

 Leaf-blades 3-5-lobed or angled; hispid-pubes- 

 cent. 

 Tips of sepals linear-attenuate, hirsute or 

 hispid at the base. 



Bases of the sepals conspicuously broad- 

 ened; lobes of the leaf-blades con- 

 tracted below; corolla 2.5-3 cm. long. 

 Sepals densely hirsute; tips strongly 



spreading. 

 Sepals sparingly barbate with whit- 

 ish hairs, tips not strongly spread- 

 ing. 

 Bases of the sepals not conspicuously 

 broadened, linear-lanceolate; lobes of 

 the leaf-blades rarely contracted be- 

 low; corolla 3-6 cm. long. 

 Tips of sepals merely long-acuminate, erect, 

 shghtly pubescent. 



Bracts 4-8 mm. long; sepals puberulent 



or sparingly pubescent. 

 Bracts 12-20 mm. long; sepals appressed 

 pubescent with silvery hairs. 

 Foliage and stems nearly glabrous or finely ap- 

 pressed-pubescent; sepals glabrous or nearly so, 

 veined and merely acuminate, 16-20 mm. long. 



35. /. mutabilis. 



36. /. villosa. 



37. /. ampullacea. 



38. /. thurberi. 



39. /. barbigera. 



40. 7. hederacea. 



41. I. desertorum. 



42. I. Nil. 



43. 



44. 



7. vahliana. 

 I. Learii. 



45. 7. cathartica. 



31. Ipomoea decasperma Hallier f. Bull. Herb. Boiss. 5: pi. 14- 

 1897. 



386. 



Trailing from a large woody root; finely pubescent; leaf-blade^ orbicular-reni- 

 form, cordate-hastate, 2-4 cm. broad or sometimes 3- to 5-lobed; peduncles 1- to 

 3-flowered; sepals ovate, acuminate, 10-12 mm. long, hirsute; corolla purple, 5-6 

 cm. long; capsules globose, 10 mm. in diameter, 5-celled, 5- to 10-seeded, 5-valved. 



Type locality: Valley of Mexico, 



Distribution: Rocky hillsides, central Mexico. 



Specimens examined: Near Durnago, Palmer 591 &692, 1896 (N,Y,G). 



