ROBINSON AND GREENMAN. — TRIXIS. 11 



lanceolate, 3 to 8 cm. long, 7 to 17 mm. broad, acuminate, acute, entire, 

 narrowed at the base, dark green, sparingly pubescent and rugose above, 

 paler and finely tomentose beneath : inflorescence an open flat-topped 

 panicle ; pedicels appressed-pubescent ; bracts of the outer involucre 7 to 

 8 mm. long, the inner narrowly oblong, obtusish, 10 to 12 mm. long; 

 heads 1.5 to 2 cm. high, about 18-flowered. Mexico: without locality, 

 Gregg, no. 840 (hb. Gr.). Guanajuato: alt. 2100 m., C. C. Deam, 

 no. 175 (hb. Gr.). Queretaro : in the plains near the city, Berlandier, 

 no. 1292 (hb. Gr.) ; between Queretaro and Mexico, Berlandier, no. 1228 

 (hb. Gr.). 



12. T. angustifolia, DC. Shrub, about 1 ra. high, fasciculately 

 branched, grayish green : leaves linear or lance-linear, attenuate at each 

 end, 3 to rarely 9 cm. long, usually about 4 (rarely as much as 15) mm. 

 broad, hirsute-tomentose beneath, mostly erect or appressed, the upper- 

 most shorter but otherwise similar ; margins strongly revolute : heads 

 about 2 cm. long, subsolitary or aggregated into fascicles ; scales of the 

 inner involucre 8, lance-linear, attenuate. — Prodr. vii. pt. 1, 69 (1838) ; 

 Hemsl. 1. c. 258; Gray, Syn. Fl. i. pt. 2, 409, in part. T. rosmarini- 

 folia, Nees, Linnaea, xx. 699 (1847) ; Walp. Ann. i. 460. — Mexico : 

 without further locality, Gregg, no. bdQ; in the Sierra Nevada of north- 

 west Mexico, Seemann, no. 2046 (hb. Gr.). Durango : shady hillsides 

 near the city, alt. 1850 m., Palmer, no. 30, Nelson, no. 4599. Zacate- 

 Cas: hills about the city, Pringle, no. 180. San Luis Potosi : Berlan- 

 dier, nos. 1284, 1353 (both in hb. Gr.), alt. 1800 to 2500 m., Parry ^ 

 Palmer, no. 549 (hb. Gr.), Schaffner, no. 285 (hb. Gr.) ; Penasco, C. S^ 

 E. Seler, no. 1138. 



= = = Leaves glandular-dotted beneath. 



13. T. californica, Kellogg. A much branched shrub, 0.3 to 1 m. or 

 more in height ; branches and branchlets appressed-puberulent, glabrate : 

 leaves lanceolate, 2.5 to 10 cm. long, 0.5 to 2 cm. broad, acute or acu- 

 minate, entire or mucronulate-dentate, sessile or narrowed below to a 

 subpetiolate ba«e, sparingly appressed-puberulent on both surfaces to 

 nearly or quite glabrous, densely glandular-atomiferous beneath, usually 

 pale green: heads 1.5 to 2 cm. high, commonly 12-14-flowered; inner 

 iuvolucral scales 8 to 10 in number, 10 to 15 mm. in length, thickened 

 and somewhat obtusely keeled at the base, slightly exceeding the lance- 

 linear to subobovate outer bracts, glandular-pubescent with a few sub- 

 appressed non-glandular hairs intermixed. — Proc. Calif. Acad. ii. 182. 

 fig. 53 (1862). T. suffruticosa, Wats. Bot. Calif, ii. 459 (1880). 



