10 PROCEEDINGS OF THE AMERICAN ACADEMY. 



*-<• -w- Inner bracts of the involucre 8 ; flowers 10 to 25. 

 = Leaves strongly discolorous, silvery-sericeous beneath. 



8. T. hyposericea, Wats. Slender branching shrub with smooth 

 light brown terete branchlets and narrowly lanceolate entire attenuate- 

 acuminate willow-like leaves 4 to 6 cm. long, 6 mm. broad, green, 

 slightly rugose, and inconspicuously villous above, white and silky-villous 

 beneath: pedicels slender, finely appressed-pubescent ; heads small, 1.4 

 cm. long; outer involucral bracts small, lanceolate, green, 3 to 4 mm. 

 long, the inner about 1 cm. long. — Proc. Am. Acad. xxv. 157 (1890). — 

 Jalisco: in a barranca near Guadalajara, Pringle, no. 1741 (hb. Gr.). 



9. T. Pringlei, n. sp. Shrub ; stems below covered with a light gray 

 cortex, glabrous ; branchlets subappressed-tomentulose and sericeous : 

 leaves lanceolate, 3 to 7 cm. long, 6 to 12 mm. broad, acuminate, acute, 

 entire, revolute-margined, narrowed below into a subpetiolate base, sub- 

 hirtellous above, silvery-tomentose and sericeous beneath : inflorescence 

 loose; heads 15 to 18 mm. high, 12-15-flowered ; inner scales of the 

 involucre about 1 cm. in length and as well as the outer glandular-puber- 

 ulent. — Oaxaca : Tomellin Cailon, alt. 925 m., 22 December, 1894, 

 Pringle, no. 5894 (hb. Gr.). 



10. T. Haenkei, Sch. Bip. Shrub; stems covered with a brown cortex, 

 at first sericeous-tomentose, later glabrate : leaves lanceolate to lance- 

 oblong, 3 to 12 cm. long, 1 to 3.5 cm. broad, acuminate, acute, entire 

 or denticulate, subsessile or narrowed at the base to a short petiole 

 (8 mm. or less in length), at first pubescent above but soon glabrate, 

 silky-tomentose beneath: inflorescence dense; heads 1.5 to 2 cm. high, 

 12-14-flowered ; inner bracts of the involucre 8, about 14 mm. in 

 length, appressed-pubescent often with gland-tipped hairs intermixed, 

 usually longer than the outer bracts. — Sch. Bip. in Seem. Bot. Herald, 

 314 (1852-57) ; Hemsl. Biol. Cent.-Am. Bot. ii. 258; Mueller, Ann. v. 

 314. T. angusti folia, Vasey & Rose, Contr. U. S. Nat. Herb. i. 73 (1790), 

 not DC. — JNIexico : without locality, Liehmann, no. 404 (fragment and 

 tracing in hb. Gr.) ; in the Sierra Nevada of northwestern Mexico, 

 Seeivann (hb. Gr.). Jalisco : roadside between Mascota and San Se- 

 bastian, Nelson, no. 40G8. Lower California, La Paz, Palmer, no. 7 

 (coll. of 1890). 



= = Leaves tomentulose beneath. 



11. T. rugulosa, n. sp. Shrub, 10 to 16 dm. high; branches light 

 brown, sometimes inconspicuously winged, the wings narrow, scarcely 

 herbaceous, decurrent in pairs from the base of the petiole : leaves 



