ROBINSON AND GREENMAN. — TRIXIS. 9 
vii. pt. 1, 68; Hemsl. Biol. Cent.-Am. Bot. ii. 258. 7. obvallata, Hook. 
& Arn. Bot. Beech. Voy. 300, t. 65 (1840); Walp. Rep. ii. 682; Seem. 
Bot. Herald. 314; Rose, Contr. U. S. Nat. Herb. i. 106, 338. 7. con- 
ferta, Benth. Pl. Hartw. 289 (1848); Walp. Ann. ii. 950. Perdicium 
longifolium, Sessé and Mocifio, acc. to Don, |. c.— Mexico: without 
special locality, Sessé & Mociio ; 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, acc. to Hemsl., l.c). Ja- 
Lisco : hills near Guadalajara, Pringle, nos. 2173, 2431 (both in hb. Gr.) ; 
Dugés, MM. (hb. Gr.). Cotrma: Palmer, 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. — ? 7. tnvolucrata, Don. Trans. Linn. Soc. xvi. 193 
(1838). — Hipateo: 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.). 
+ + 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. 
ae 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 scales, 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 § Gonzalez, no 
