JONES. — A REVISION OF THE GENUS ZEXMENIA. 149 



podocepltala, Gray, PI. Wright, ii. 92 (1853) ; Rothrock in Wheeler, 

 Rep. 164; Torr. Bot. Mex. Bound. 92; Hemsl. Biol. Cent.-Arn. Bot. ii. 

 190. — Rocky hills of southwestern United States to Guatemala. Speci- 

 mens examined, — Arizona : Chiricahua Mountains, Rothrock, no. 517 ; 

 near Fort Huachuca, Wilcox, no. 319 ; Huachuca Mountains, Lemtnon, 

 no. 374 ; Santa Rita, Pringle, no. 57. Chihuahua : near the City, Prin- 

 gle, no. 349; Colonia Garcia, Townsend S? Barbour, no. 219; in the 

 southwestern part, Palmer, no. II, coll. of 1885. Sonora: Santa Cruz, 

 Wright, no. 1239 (type, in herb. Gray); Alamos, Palmer, no. 362, coll. 

 of 1890. 



8. Z. Pahneri, Greenman, n.sp. " Stem erect, 5 to 6 dm. high, ap- 

 parently from a woody base, hirsute-pubescent: leaves showing a tendency 

 to alternation, short-petioled, elliptical-lanceolate or oblong, 5 to 10 cm. 

 in length, 2 to 4 cm. broad, acute or acuminate, serrate-dentate except 

 toward the base, hirsute-hispid on both sides : heads 1 to 2 cm. high ; 

 peduncles solitary, terminal and axillary, 1 to 2 dm. long, naked or 

 sparingly bracteolate, appressed-pubescent ; involucre 3-seriate, the outer 

 scales longer than the inner, lance-oblong, 12 to 18 mm. in length, acute 

 or obtuse, externally hirsute-hispid: ray-flowers about 15; disk-flowers 

 numerous : achenes narrowly margined on the inner side. — Southern 

 Mexico. Specimens examined, — Jalisco: Rio Blanco, Palmer, no. 50, 

 coll. of 1886 (type, in herb. Gray). The specimen here proposed as a 

 new species was doubtfully referred by the late Dr. Sereno Watson to 

 Z. podocepliala, Gray, and its affinity certainly seems to be with that spe- 

 cies ; but it is readily distinguished by the distinctly although shortly 

 petiolate leaves, and by their lanceolate rather than ovate form." 



= = Peduncles less than 1 dm. long. 



a. Pappus of the disk-achenes consisting of 2 short teeth connected by a shallow 

 more or less continuous border (connate squamellae) : ligules purple. 



9. Z. Rosei, Greenman. Herbs, 3 to 4 dm. high ; roots several, 

 fusiform-thickened ; stem terete, leafy chiefly below the middle, cov- 

 ered by a dense spreading grayish villous pubescence, also finely and 

 obscurely puberulent: leaves opposite, membranaceous, oblanceolate- 

 oblong, acutish, short-petioled, subremotely serrate, scabrous-pubescent 

 above with thick-based hairs, grayish tomentose and reticulate-veiny 

 beneath, 6 to 16 cm. long, 2 to 5 cm. wide: inflorescence a rather con- 

 tracted terminal cyme subtended by 1 or 2 pairs of large foliaceous 

 bracts; heads 12 mm. high; involucre campanulate, 2-3-seriate; the 

 outer scales subfoliaceous, oblanceolate, coarsely pubescent, obtusish : 



