6 PROCEEDINGS OF THE AMERICAN ACADEMY. 



ray-flowers with ligules much smaller than in the j^receding, about 1^- 

 lines in diameter : the tube being relatively very long and slender (4 to 5 

 lines in length) : chaff terminating in a long and slender awn. — T. bal- 

 bisioides. Gray, 1. c. xxii. 430, not xv. 39. T. balhisioides, var. tenui- 

 folia, Gray, (ined.) in distribs. Palmer and Pringle. — Jalisco, on the 

 Rio Blanco, Palmer, no. 569 ; on rocky hills near Guadalajara, Pringle, 

 nos, 2179, 255 G. The later collections of Mr. Pringle show this plant 

 quite distinct in its woody base and reduced rays from T. balhisioides. 



++ t-f Rays white, purplish, or roseate. 

 = Pappus much longer than the achene. 



7. T. rosea, Schz. Bip. in herb. Hirsutulous annual, leafy near the 

 base and often with spreading branches : leaves linear-oblong, irregularly 

 toothed or trifid with toothed lobes : peduncles becoming very long (6 to 

 10 inclies), quite simple, naked or bearing 1 or 2 minute alternate brapts : 

 heads large, with the spreading rays an inch or more in diameter: ligules 

 oblong, 3 to 5 lines in length, slightly 3-toothed at the apex. — A good 

 but apparently unedited species, founded by Schultz upon Schaffner's 

 no. 60, from Guadalupe, and collected in the same locality by Bilimek 

 in 1865, no. 488, and Bourgeau, no. 586; also in Valley of Mexico, 

 Schaffner, no. 265. 



= = Pappus sliorter than or barely equalling the achene. 



8. T. Palmeri, Gray. Pubescent or puberulent, 2 feet high, usu- 

 ally with a few ascending branches, naked above : leaves mostly much 

 cleft or deeply and laciniately parted into narrow acute segments : rays 

 broad, obovate, truncate, essentially entire, roseate : disk-flowers greenish 

 yellow. — Proc. Am. Acad. xv. 38. — San Luis Potosi, on rocky bluffs 

 at Alvarez, altitude 8,000 feet, Parry ^ Palmer, nos. 489, 490, 482^, 

 also Schaffner, no. 236. 



Var. indivisa, Robinson & Seaton. Somewhat stouter and more 

 densely pubescent : leaves ovate, subhastate, abruptly contracted into a 

 petiole, repand-dentate, not lobed. — Proc. Am. Acad, xxviii. 109. — 

 Ledges of canons on mountains near Lake Chapala, Jalisco, Pringle., no. 

 4332. Mr. Pringle states that the base is perennial. 



■4- -1- South American species, of the Andes of Bolivia and Ecuador: leaves 

 narrow : pappus longer than the achenes. 



9. T. Mandonii, Schz. Bip. Branched, hirsute : leaves sinuate or 

 repand-dentate : involucral scales rounded at the apex, sparingly puberu- 

 lent near the ends or quite glabrous : rays very small. — Bull. Soc. Bot. 

 Fr. xii. 82, & Linnaea, xxxiv. 536. Mandonia Boliviensis, Wedd. Bull. 



