8 PROCEEDINGS OF THE AMERICAN ACADEMY. 



species, but agreeing with the type in all floral characters except the 

 somewhat broader involucral scales. 



= = Annuals. 



12. T. obovata, Turcz. Low, 4 to 6 inches in height: leaves 

 obovate, subentire, obtuse: ligules short, yellowish. — Bull. Soc. Nat. 

 Mosc. xxiv. 187; Walp. Ann. 238. — S. Mexico, on .Sierra San Pedro, 

 Nolasco, Talea, &c., Jurgensen, no. 124. Here we would refer speci- 

 mens collected near Acapulco by Palmer, no. 165, 



13. T. erecta, Gray. Slender, erect, hirsutulous, branching, a 

 foot or so in height : leaves ovate-lanceolate and serrate or broadly ovate 

 in outline and rather deeply 3-parted with acutish lobes : heads rather 

 small : involucre ovate ; one or two of the outer scales often narrow, 

 oblong, and spreading : ligules short, only a line or two in length, 3- 

 toothed, yellow. — Proc. Am. Acad. xxi. 390, 433. — Southwestern 

 Chihuahua, Palmer, no. 285. 



14. T. tenuifolia, Rose. Erect, pubescent, 1 to 2 feet high, branch- 

 ing : leaves ovate, petiolate, dentate but not lobed : outer scales of the 

 involucre acuminate : rays conspicuous, 3 to 5 lines long, pale yellow or 

 " bright white." — Contrib. U. S. Nat. Herb. iii. 319. T. bicolor, Gray, 

 Proc. Am. Acad. xxi. 391, as to pi. Palmer. — Southwestern Chihuahua, 

 on mountain sides above Batopilas, Palmer, no. 130. 



Var. microcephala. Rose, 1. c. Described as diflTering in its smaller 

 heads and '' slightly different disk corollas." — " Near Lodiego, Palmer, 

 no. 1611." 



+H- ++ Pappus shorter than the achenes. 



= Annual species of Northwestern Mexico : heads large, an inch in diameter. 



15. T. bicolor, Gray. Erect annual, with leaves ovate to rather 

 narrowly oblong-lanceolate, serrate-dentate, not lobed, narrowed to slender 

 petioles: ligules reddish or purplish, cuneate-oblong, 3-tootlied. — PI. 

 Fendl. 104. — Llanos in the Sierra Madre, W. Chihuahua, Wish'ze7ius, 

 no. 214; also among rocks, Bachimba, Thurber, no. 833, and on rocky 

 hills near the town of Chihuahua, Pringle, no. 638. 



= = Species of Southern Mexico, hgnescent at tlie base. 



1 6. T. Galeottii, Klatt. " Stem terete, branched, pilose : leaves 

 petiolate, cuneate, irregularly lobed, pilose upon both surfaces, 2 inches 

 long, 11 inches broad, 3-nerved : heads solitary, terminal; involucral 

 scales biseriate, the outer shorter: chaff 3-5-dentate at the apex." — 

 Leopoldina, xxiii. 6. Plilostephium Galeottii, Schz. Bip. ^c?e Klatt, I.e. 

 — Between San Andres and San Miguel, Liehmann, nos. 588, 693. and 



