ROBINSON AND GREENMAN. — TRIXIS. 9 



vii. pt. 1, 68; Herasl. Biol. Cent.-Am. Bot. ii. 258. T. ohvaUata^ Ilook. 

 & Am. Bot. Beech. Voy. 300, t. 65 (1840); Walp. Rep. ii. 682; Seem. 

 Bot. Herald. 314 ; Rose, Contr. U. S. Nat. Herb. i. 106, 338. T. con- 

 ferta, Benth. PI. Hartw. 289 (1848) ; Walp. Ann. ii. 950. Perdicium 

 longifolium, Sesse and Mociiio, ace. to Don, 1. c. — Mexico : without 

 special locality, Sesse 4* Mocino ; between San Luis Potosi and Tampico, 

 Palmer, no. 1121 (coll. of 1878-1879) ; Sierra Madre, northwest Mexico, 

 Seemann (hb. Gr.). Sonora : Alamos, Palmer, no. 290 (hb. Gr.). 

 GuANAJAUTO : Guanajauto, Berlandier, no. 1327 (hb. Gr.) ; Leon and 

 Guanajuato, Hartweg, no. 1609 (hb. Kew, ace. to Hemsl., 1. c). Ja- 

 lisco : hills near Guadalajara, Pringle, nos. 2173, 2431 (both in hb. Gr.) ; 

 Z>H^e5, MM. (hb. Gr.). Colima : P«/mer, no. 1235 (hb. Gr.). Guer- 

 rero : Acapulco, Hinds. 



Var. sericea, n. var. Stem 6 to 9 dm. high: upper leaves (the only 

 ones shown in the specimen at hand) densely and permanently silvery- 

 sericeous beneath. — ? T. involucrata, Don. Trans. Linn. Soc. xvi. 193 

 (1838). — Hidalgo : hills near Tula, alt. 2300 m., Pringle, no. 8051 

 (hb. Gr.). 



Var. platyphylla, n. var. Leaves large, obovate, flat, entire or 

 nearly so, sparingly soft-pubescent beneath, 1 dm. long, 3.5 to 4 cm. 

 broad, sharply acuminate : inflorescence more open than in either of the 

 other forms ; the bracts subtending its branches ovate, glanduliferous. — 

 Guerrero: near Acapulco, Palmer, no. 522, October, 1894 to March, 

 1895 (hb. Gr.). 



-t- •*- Outer bracts of the involucre linear to narrowly ovate, mostly much 

 shorter than the inner. 



++ Inner bracts of the involucre 5; flowers 5 to 7. 



7. T. oligantha, n. sp. Shrub ; stems covered with a brown or 

 grayish brown bark, at first pubescent, later glabrate : leaves lanceolate, 

 3 to 9 cm. long, 7 to 25 mm. broad, acuminate, mucronately acute, entire 

 or mucronulate-denticulate, narrowed below into a subpetiolate base, at 

 first pubescent above, later more or less glabrate, appressed-sericeous- 

 tomentose beneath: heads 12 to 18 mm. high, 5-7-flowered, disposed in 

 rather close clusters borne in a corymbose panicle ; outer bracts of the 

 involucre lanceolate or lance-ovate, sometimes nearly or quite equalling 

 the lance-linear acuminate appressed-pubescent inner scaler, the latter 

 10 to 12 mm. long. — Oaxaca : Monte Alban, 27 November, 1894, 

 Pringle, no. 5826; Cerro de San Felipe, alt. 1700 m., 29 March, 1896, 

 Conzatti Sj Gonzalez, no. 70. 



