512 PROCEEDINGS OF THE AMERICAN ACADEMY. 



calyx generally with shorter pubescence. — Bull. Soc. Bot. Belg. xxx. 

 236 (fe Ann. Conserv. Jard. Bot. Geneve, 1. c. S. caesia, Willd. Enum. 

 i. 40; HBK. 1. c. 295. — Central Mexico to Central America. Hidalgo, 

 Guadalupe, Valley of Mexico, Aug., 18G5-66 (Bourgeau, nos. 721, 854), 

 Aug. 17, 1865 {Bilimek, no. 316) : Mexico, Takubaya, Aug. 28, 1865 

 (Bilhnek, no. 315) : Oaxaca, near Puebla, alt. 2,150 m., Nov. 9, 1895 

 (L. C. Smith, no. 908). 



Var. philippensis. Leaves as in the species : racemes simple, 

 elongated, 1 to 2 dm. long: calyx short villous. — Oaxaca, Sierra de 

 San Felipe, alt. 2,300 m., Sept. 1, 1894 (E. W. Nelson, no. 1175), Oct. 

 5, 1894 {C. G. Pringle, no. 4953). 



Var. seorsa. Similar to the last: leaves glabrate beneath: racemes 

 simple, elongated ; verticels many-flowered, the lower 2 to 3 cm. apart. — 

 Mexico, Valley of Mexico, Sept. 19, 1889 (C. G. Pringle, no. 2818). 



Var. albicans. Leaves ovate, thinner than in the other forms, 

 slightly canescent above, very white-tomentose beneath : racemes simple, 

 1 to 1.5 dm. long : calyx densely white-villous. — S. purpurea, var. 

 pubens, Donnell Smith, I.e. iii. 67, not Gray. — Guatemala, Santa 

 Rosa, Depart. Santa Rosa, alt. 920 m., Nov., 1892 {Heyde & Lux in 

 exsicc. J. D. Smith no. 4394). An extremely canescent plant. 



Var. POTOSINA, Briq. 1. c. Leaves ovate-lanceolate or lanceolate, 

 long-acuminate, pubescent as in the species: racemes simple, 1 dm. or 

 less long : calyx hirsute. — San Luis Potosi, San Jose Pass, July 23, 

 1890 ((7. G. Pringle, no. 3224). 



d. Leaves pilose-hispid or glabrate beneath : stems and calyces pubescent with 



slender spreading glandular hairs. 



64. S. aequidistans. Erect or ascending: stems 1.5 to 4 dm. high, 

 glandular-hirsute : leaves rather remote, the lower small, the upper 

 much larger, oblong-ovate to broadly deltoid-ovate, obtuse, the upper- 

 most 3 to 4.5 cm. long, crenate-serrate, more or less setulose above: 

 racemes slender, elongated, 0.5 to 2 dm. long ; the verticels 2-6-flowered, 

 all remote, the lower equidistant, 2 to 3 cm. apart : pedicels filiform, 2 

 to 4 mm. long : calyx campanulate, strongly bilabiate, the tube twice or 

 thrice as long as the ovate lips ; upper lip entire, lower short-cleft : 

 corolla 1.3 cm. long, the pilose or glabrate tube ventricose, nearly twice 

 exceeding the calyx ; lip a little exceeding the pilose galea : style 

 bearded. — Sinaloa, between Rosario and Colomas, July 12, 1897 (/. 

 N. Rose, no. 1609). 



