186 ANNALS NEW YORK ACADEMY OF SCIENCES 



2. Ipomoea petrophila House, Bot. Gaz. 43: 401. 1907. 



Stems erect from a large root, pale and finely tomentulose above, 30-60 cm. 

 high; leaf-blades lanceolate, 4-10 cm. long, 3-nerved and obtuse at the ends, finely 

 sericeous pubescent beneath; sepals unequal, oblong, obtuse, the inner ones 8-11 mm. 

 long; corolla white with a pale purple throat, 6-8 cm. long, glabrous; the pedimcles 

 1-3-flowered, 1-5 cm. long; capsules ovoid-conical, 14-16 mm. high, thick-walled. 



Type locality: Near Chihuahua, Mexico. 

 Distribution: Rocky hills, northern Mexico. 



Specimens examined: Pringle 340, 1885 (tj'pe — N). Santa Eulalia 

 plains, Wilkinson, 1885 (N). 



3. Ipomoea longifolia Benth. PI. Hartw. 16. 1839.— Small, Fl. South- 



eastern U. S. 962. 1903. 



Convolvulus Schumardianus Torr. Bot. Marcy's Rep. 291. 1853. 

 Ipomoea Carletoni Holzinger, Contr. Nat. Herb. 1: 211. 1892. 

 Convolvulus Queretanensis Sesse & Moc, Fl. Nov. Hisp. in La Naturaleza II. 1: 27. 

 1887.— Fl. Mex. 1. c. II. 2: append. 36. 1893. 



Type locality: Mexico. 



Distribution: Prairies and plains, Oklahoma and Texas to Arizona 

 and south in Mexico to Queretaro and Durango. 



Illustrations: Bot. Reg. pi. 21. Contr. Nat. Herb. 1: pi. 17. 



Specimens examined: Oklahoma: Carleton (N); Blankinship (G). 

 New Mexico: Wright 1617, 1851. Arizona: Tourney 2580 (Y); Lemmon 

 2834; Wilcox 375. Mexico: Durango, Palmer 229 (Y, N). Sonora: 

 Thurber 710. Queretaro: Rose, Painter & Rose 95U (N, Y); Hartweg 97 

 (G). CYnhudihwdi'. Palmer 297. kgn^sCaWenies: E.W. Nehon 3887. 



4. Ipomoea stans Cav. Ic. 3:26. 1794.— Choisy in DC. Prodr. 9: 



355. 1845. 



Convolvulus stans H. B. K. Nov. Gen. & Sp. 3: 96. 1819. 

 Convolvulus firmus Spreng. Syst. 1: 613. 1825. 



Convolvulus sinuxiius Sesse & Moc, Fl. Nov. Hisp. in La Naturaleza II. 1: 24. 1887. 

 — Fl. Mex. 1. c. II. 2: append. 38. 1893. 



Type locality: Matritense. 

 Distribution: Northern and western Mexico. 

 Illustrations: Cav. 1. c. pi. 250. Altamirano, Mat. Mex. pi. 282. 

 Specimens examined from Coahuila, San Luis Potosi, Guanajuato, 

 Hidalgo, Valley of Mexico, Orizaba and Oaxaca. 



