500 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Central Mexico. Durango, infrequent on shady slopes of ravines, 

 Santiago Fapasquiaro, Aug., 189 Q (Udw. Palmer, no. 4:51) : San Luis 

 PoTOSi, alt. 1,850 to 2,460 m., 1878 {Parry & Palmer, no. 736) : 

 Mexico, barranca near Santa Fe, July 6, 1865-66 (Bourgeau, no. 

 '490) ; Santa Fe, Sept. 3, 1899 {C. G. Pringle, no. 7991). 



* * Bracts less conspicuous, soon deciduous : calyx campanulate, conspicuously 



bilabiate, subinflated. 



H- Leaves sessile or subsessile or narrowed to short inconspicuous petioles : racemes 

 elongated, at least the lower verticels becoming remote : perennials. {S. 

 assurgens may be looked for here.) 



++ Stems leafy nearly or quite to the inflorescence. 



= Without glandular hairs on stem and calyx. 



29. S. ANGUSTiFOLiA, Cav. Stems hispid, bearded at the nodes, 2 to 

 7 dm. high, very leafy: leaves mostly hispid on the margins and nerves 

 — Ic. iv. 9, t. 317; Lindley, Bot. Reg. xviii. t. 1554; Sweet, Brit. FL 

 Gard. n.s. iii. t. 219; Benth. I.e. 301; Hemsl. I.e. 552; Gray, Syn. Fl. 

 N. A. ii. 369 ; Briq. 1. c. S. reptans, Jacq. Hort. Schoen. iii. 38, t. 319. 

 S. virgata, Ort. Dec. i. 3. — Central and Southern Mexico. Zaca- 

 TECAS, near Plateado, Sept. 2, 1897 (/. N. Rose, no. 2745) : Jalisco, 

 Valley of Mexico, Tizapan, June 26, 1865-66 {Bourgeau, no. 125, in 

 part) : Michoacan, TIalpujahua 1828 (Graham) ; plains near Patzcuaro, 

 Aug. 7, 1892 (C. G. Pringle, no. 4163). S. Unifolia, Mart. & Gal. 

 I. c. 70, and Benth. 1. c. 302, from Michoacan is probably only a form 

 with rose-colored corolla. 



Var. GLABRA, Gray, 1. c. Stems and leaves glabrous. — S. leptophjlla, 



Benth. Lab. 249, & in DC. 1. c. 299. S. azurea, Torr. Bot. Mex. Bound. 



131, in part. — From Texas through central and southern Mexico, of 



broader range than the hispid type. San Luis Potosi, in sand near the 



city of San Luis Potosi, 1876 {Schaffner, no. 672) : Aguas Calientes 



{Hartweg, no. 163) ; Jalisco, edge of swamp, Guadalajara, July, 1886 



(Edw. Palmer, no. 226): Chiapas, without locality, 1864-70 {Ghies- 



breght, no. 751) ; valley of Jiquipilas, alt. 650-1,100 m., Aug. 16, 1895 



{E. W.Nelson, no. 2922). 



= = Glandular-hairy. 



30. S. heterotricha. Stems erect from a rather woody base, 2.5 to 

 4.5 dm. high, puberulent, and, especially above, bearing slender jointed 

 glandular hairs : leaves linear-attenuate, strongly 1-3-nerved, 3 to 8 cm. 

 long, puberulent or glabrate or rarely with some slender glandular hairs : 

 raceme 2 cm. or less in length; verticels all remote, the lower 3 to 4 cm. 

 apart, 3-9-flowered : bracts lanceolate to ovate-lanceolate, glandular- 



