210 ANNALS NEW YORK ACADEMY OF SCIENCES 



54. Ipomoea tyrianthina Lindl. Bot. Reg. Misc. 87. 1832. — Choisy 



in DC. Prodr. 9: 375. 1845. 



^.Convolvulus serotinus DC. Cat. Hort. Monsp. 97. 1813. 



?Ipom<jea serotina Roem. & Schult. Syst. 4: 215. 1819. 



Convolvulus sanguineus Willd.; Roem. & Schult. 1. c. 302. 



Convolvulus superbus H. B. K. Nov. Gen. & Sp. 3: 103. 1819. 



Ipomoea superba G. Don, Gen. Syst. 4: 275. 1838. Not 7. superba Ledeb. 1822, 



or Schrank, 1828. 

 Pharbitis tyriaiithina Hook. Bot. Mag. 69: pi. 4024- 1843. 

 Pharbitis serotina Choisy in DC. Prodr. 9: 341. 1845. 



Resembling I. longipedunculata, but usually more hipid-pubescent ; sepals oblong, 

 hispid, acutish, subequal, 12-15 mm. long; corolla campanulate-funnelform, 6-7 

 cm. long, the tube 2-3 cm. thick, pubescent wdthout. 



Type locality: Between Aguasarco and Volcan Joriillo, Michoacan, 

 Mexico (H. B. K.). 



Distribution: ISIountain Forests, southern Mexico. 



Specimens examined: Guerrero; Near Chilpancingo, 9000-10200 ft. 

 alt. E. W. Nelson 2161, 1894 (G, N). 



55. Ipomoea venusta (Mart. & Gal.) Hemsley, Biol. Cent.-Am. Bot. 



2: 385. 1882. 



Calonyction venustum Mart. & Gal. in Bull. Acad. Brux. XII. 2: 269. 1845. — Walp. 

 Rep. 6: 531. 1846-47. 



Stout, perennial, woody below; stems velvety pubescent and tomentose; leaf- 

 blades orbicular-ovate, 10-20 cm. long, shallowly cordate, acute, entire or slightly 

 3-lobed, appressed-pubescent above, silverj'-canescent beneath; sepals oblong-lanceo- 

 late, acute or obtuse, 22-30 mm. long, silky-tomentose without; coroUa campanu- 

 late-funnelform, 8-9 cm. long, the tube about 2 cm. thick, hirsute without on the 

 pUcae and tube. 



Type locality: Province of Tobasco, Mexico. 



Distribution: Southern Mexico and Central America. 



Specimens exajviined: Puebla; Huatusco, Conzatti 850, 1898 (G). 

 Guatemala : Chiapas, Santa Rosa, /. Donnell Smith (legit Heyde & Lux) 

 4S50, 1892 (G, C). 



Section III. BATATAS. 



9. Erpipomoea. Creeping or prostrate, annual or perennial vines; 

 roots sometimes tuberous, or stems rooting at the nodes; leaf-blades entire 

 or lobed. 



