12 PROCEEDINGS OP THE AMERICAN ACADEMY. 



T. angustifolia, Gray, PI. Wright, i. 128 (1852), & ii. 102 (as to 

 iios. 413 & 1299), also Syn. Fl. i. pt. 2, 409, in part, not DC. T. an- 

 gustifolia, var. latiuscula, Gray, 1. c. 410. 7'. frutescens, Gray, Bot. 

 Mex. Bound. 103 (1859), vars. ; not Sch. Bip. in Seem. Bot. Herald, 314 ; 

 not P. Browne. — California : San Diego County, Tautillas Canon, 

 Palmer (coll. of 1875); Colorado Desert, Lemmon 4' Parry, no. 1185, 

 Wright, no. 196; Agua Calieute, Parish, no. 353 (hb. Gr.). Lower 

 California : Cedros Island, Veatck, Greene (hb. Gr.), Palmer, no. 094 

 (hb. Gr.), Anthony, nos. 49, 318 (both in hb. Gr.) ; Island of San 

 Pedro Martin, Palmer, no, 408 (hb. Gr.) ; Magdalena Island, Bran- 

 degee (hb. Gr.) ; Canons Cantillas, Orcutt, no. 1102. Arizona: 

 rocky canons of the Santa Catalina Mountains, Pringle (hb. Gr.) ; 

 Camp Grant, Palmer, no. 143 (hb. Gr.) ; Tempe, Ganong S^- Blaschka 

 (hb. Gr.) ; without locality, Lemmon (hb. Gr. ) ; Tucson, Greene, no. 

 1099 (hb. Gr.); Grand Caiion, Gray (hb. Gr.). Neat Mexico: 

 Manyos Caiion, Greene, no. 101 (hb. Gr.) ; Bear Mountains, Rusby, 

 no. 203 (hb. Gr.) ; Organ Mountains, Wooton, no. 107 (hb. Gr.). 

 Texas: western part, Havard, no. 74 (hb. Gr.). Sonora : ravines 

 near Santa Cruz, Wright, no. 1299 (hb. Gr.). Chihuahua: among 

 rocks, Bachimba, Thurber, no. 830 (hb. Gr.) ; hills near the city, Prin- 

 gle, no. 30 (hb. Gr.) ; Santa P^ulalia Mountains, Pringle, no. 525 (hb. 

 Gr.) ; near Lake Santa Maria, Nelson, no. 6407 (hb. Gr.). Coahuila : 

 Soledad, Palmer, no. 2089 (hb. Gr.) ; Parras, Palmer, no. 745 (hb. 

 Gr.) ; Torreon, Pahner, no. 786 (hb. Gr.). San Luis Potosi : near 

 Opito, Gregg (hb. Gr.). 



14. T. silvatica, n. sp. Branching shrub with light brown branch- 

 lets ; cortex tending to exfoliate: leaves thin, ovate-oblong, acuminate, 

 cuneate at the sessile base, sharply but rather finely dentate, green, 

 slightly pubescent and obscurely glandular above, scarcely paler, finely 

 pubescent and distinctly glaudular-atomiferous beneath, 5 to 8 cm. long^ 

 2 to 3 cm. broad : heads few or many at the ends of the branches in 

 rounded corymbose panicles, about 12-flowered, 2 cm. long in fruit; outer 

 involucral bracts thin, lanceolate or oblanceolate, acuminate, glandular- 

 atomiferous, 12 to 15 mm. long, 3 to 5 mm. broad, the inner 8, linear, 

 short-acuminate, about 12 mm. long, glandular-pubescent: mature acheues 

 7 to 9 mm. long; pappus slightly tawny, about 8 mm. long. — Oaxaca : 

 in dry wooded gorges on the River Tehuantepec, C 8^ E. Seler, no. 1633 

 (hb. Gr.) ; without locality, Liebmann, no. 405 (hb. Gr.). — Distin- 

 guished from the preceding species by its thinner larger leaves, the spread- 

 ing villous pubescence of the inflorescence, and by the shorter pappus. 



