§34 ‘ PROCEEDINGS OF THE AMERICAN ACADEMY. 
l.c. 557; Brig. in Engl. & Prantl l.c. S. microphylla, Gray, Proc. 
Am. Acad. xxi. 407, in part, not Benth. — Northern and central 
Mexico, not clearly separable from S. microphylla. Cutmuanua, 100 
km. south of Guadalupe y Calvo, alt. 2,300 to 2,620 m., Aug., 1898 
(Z. W. Nelson, no. 4812"); Batopilas, alt. 1,690 to 2,000 m., Oct. 1898 
(£. A. Goldman, no. 212): Coauulta, hillside, Saltillo, } May, 1898 (Edw. 
Palmer, no. 161)? Duranco, by stream, Durango, Nov. 1896 (Hdw. 
Palmer, no. 844); near El Salto, July 12, 1898, and in the Sierra 
Madre, 25 km. north of Guanacevi, alt. 2,300 to 2,620 m., Aug. 17, 1898 
(£. W. Nelson, nos. 4557, 4755): Zacatecas, hills of Zacatecas, Oct. 
26, 1888 (C. G. Pringle, no. 1764) ; in the Sierra Madre, Aug. 18, 1897, 
and near Plateado, Sept. 4, 1897 (J. N. Rose, nos. 2402, 2804): San 
Lurs Porost, in the mountains about San Luis Potosi, 1876 (Schaffner, 
no. 660), 1878 (Parry & Palmer, nos. 747, 748): Vera Cruz, Mt. 
Orizaba, alt. 2,770 m., Aug. 8, 1891 (Seaton, no. 260): Hipareo, Zima 
pan (Coulter, no. 1093): Mrxtco, ledges and banks, Sierra de las 
Cruces, Oct. 23, 1892, and Serrania de Ajusco, alt. 2,770 m., May 23, 
1898 (0. G. Pringle, nos. 4298, 7548). 
2. Leaves pubescent beneath. 
Shrubs. 
+ Leaves mostly less than 2 cm. long. : 
139. S. micropnyttra, HBK. 1. c. 295. Leaves rounded at tip, 
slightly pubescent. — Benth. 1. c.; Hemsl. lc. 561; Gray, l.c , in part; 
Briq. 1. ec. — Central and southern Mexico. San Luts Porost, San 
Miguelito, 1876 (Schaffner, no. 662); in market of San Luis Potosi, 
1898 (Edw. Palmer, no. 6404): Mexico, Valley of Mexico (Seat 
no. 394); Toluca, Sept. 17, 1898 (Z. W. D. Holway, no. 3136): 
Oaxaca, Tehuacan, alt. 615 m., June 24, 1896 (C. Conzatti, no. 163). 
Var. CANESCENS, Gray, l.c. Leaves and branchlets densely cane 
cent-pubescent. — Caravuauwa, in shade of cliffs, hills near Chihuahua, 
Oct. 17, 1885 (0. G. Pringle, no. 637): Zacatecas, hills near Zacate- 
cas. Mar. 17, 1885 (C. G. Pringle, no. 239), alt. 2,460 m. Dec. 8, 1898 
(0.0. Deam, no. 139). 
Var. Wistizent, Gray, 1. c. 408. Puberulent: leaves narrowed 10 
acutish tips. — Cummvanva, Sierra Madre west of Chihuahua (Wislizenus, 
no. 152); north of Batopilas, 1885 (Hdw. Palmer, no. 379). 
++ Leaves larger. 
X Leaves subsessile or short (3 mm.)-petioled. 
140. S. rr1coLor, Lemaire, Ill. Hort. iii. Misc. 71, t. 120, & Fi. des 
