JONES. — A REVISION OF THE GENUS ZEXMENIA. 149 
podocephala, Gray, Pl. Wright. ii. 92 (1853) ; Rothrock in Wheeler, 
Rep. 164; Torr. Bot. Mex. Bound. 92; Hemsl. Biol. Cent.-Am. Bot. ii. 
190. — Rocky hills of southwestern United States to Guatemala. Spect- 
mens examined, — Arizona: Chiricahua Mountains, Rothrock, no. 517 ; 
near Fort Huachuca, Wilcox, no. 319; Huachuca Mountains, Lemmon, 
no. 374; Santa Rita, Pringle, no. 57. Carmuanua : near the City, Prin- 
gle, no. 349; Colonia Garcia, Townsend § Barbour, no. 219; in the 
southwestern part, Palmer, no. I, coll. of 1885. Sonora: Santa Cruz, 
Wright, no. 1239 (type, in herb. Gray); Alamos, Palmer, no. 362, coll. 
of 1890 
8. Z. Palmeri, 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 em. 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. podocephala, 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. Rose1, 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 em. 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; Ahe 
outer scales subfoliaceous, oblanceolate, coarsely pubescent, obtusish : 
