534 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I.e. 557; Briq. in Engl. & Prantl La S. microphylla, Gray, Proc. 

 Am. Acad. \\i. I"7. in part, not Benth. — Northern and central 

 Mexi '. not clearly separable from S. microphyUa. Chihuahi \. 100 

 km. south of Guadalupe y Calvo, alt. 2,800 to 2,620 m., Aug., 1 



( /.'. W. Nelson,x\o. 1812'); Batopilas, alt. 1,690 to 2,1 m., Oct 1 



i /•:. .1. Goldman, no. 212) : Coahuila, hillside, Saltillo, Mas. 1898 Edw. 

 Palmer, no. 161): Durango, by Btream, Durango, Nov. 1896 (Edw. 

 P'llnwr, no. 811); near El SaltO, duly 12, L 898, and in the Si 

 Madre, 25 km. north of Guanacevi, alt. 2,800 to 2,620 m., Aug. 17. 1898 

 (E. W. Nelson, nos. 4557, 17.").")) : Za< atecas, hills of Zacatecas, Oct. 

 26, 1888 1 G. G. Pringle, no. L764) ; in the Sierra Madre, Aug. 18, 1897, 

 and near Plateado, Sept. 1. 1897 (/. N. Rose, nos. 2402, 2804): San 

 Luis Potosi, in the mountains about San Luis Potosi, 1876 | >- ; ffher, 

 no. 660), 1878 (Parry & Palmer, nos. 7 17. 748): Vera Cruz, Mt. 

 Orizaba, alt. 2.770 ra., Aug. 8, 1891 (Seaton, no. 260) : Hidalgo, Zima- 

 pan (GoitUer, no. 1093): Mexico, ledges and hanks. Sierra de las 

 Cruces, Oct. 23, 1892, and Serrania de Ajusco, alt. 2,770 in., .May 28, 

 1898 (G. G. Pringle, nos. 4298, 7548). 



2. Leaves pubescent beneath. 



O Shrubs. 



+ Leaves mostly less than 2 cm. long. 



130. S. MICROPHYIXA, HBK. I.e. 295. Leaves rounded at tip, 



slightly pubescent. — Benth. 1. c. ; Ilemsl. 1. c. oGl ; Gray, 1. e.. in part : 



Briq. 1. c. — Central and southern Mexico. San Luis Potosi, San 



Miguelito, 1876 (Sehaffner, no. GG2) ; in market of San Luis Potosi, 



1898 (Edw. Palmer,no. 640£) : Mexico, Valley of Mexico (Schaffner, 



no. 394); Toluca, Sept. 17,1898 (E. W. D. Holway, no. 3136): 



Oaxaca, Tehuacan, alt. 615 m., June 21. 1896 (C.Conzatti, no. 163). 



Var. CANE8CENS, Gray. I.e. Leaves and branehlets denselj caues- 

 cent-pubescent. — Chihuahua, in shade of cliffs, hills near Chihuahua, 

 Oct. 17. 1885 (C. G. Pringle, no. 637): Zacatecas, hills near Zacate- 

 cas. Mar. 17. 1885 (C. G. Pringle, no. 239), alt. 2,460 m. Dec. 8, L898 

 (O.G.Deam, no. 139). 



Var. Wislizeni, day. I.e. 408. Puherulent : leaves narrowed to 

 acutish tips. — ( IhiHUAIRA. Sierra Madre wi-.-t of Chihuahua ( Wislizt THIS, 

 no. 102); north of Batopilas, 1885 (Edw. Palmer, no. 379). 



+ + Leaves larger. 

 X Leaves subsessile or short (8 mm.)-petioled. 

 140. S. tricolor, Lemaire, 111. Hort. iii. Misc. 71, t. 120, & Fl. des 



