102 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
leaves 7 to 10 cm. long, 2 to 3 cm. broad, above scabrous, beneath 
hirsute upon the veins and finely canescent-pubescent upon the 
surface: heads (excl. the rays) 2.5 to 38.5 cm. in diameter: ligules 
about 15.—Hemsl., 1. c., 161.— Oaxaca, Ghiesbreght, no. 216 
(type in herb. Kew). We follow Dr. Gray in referring to this 
species Ghiesbreght’s no. 383, from which the above characteriza- 
tion is drawn. 
35. G. megacephala. Stems simple, striate, scarcely at all sea- 
brous, covered with minute appressed hairs, also lanate in lines 
decurrent each from either side of the short winged petioles: leaves 
ovate-lanceolate with short slender caudate acumination, serrate, 
scabrous above, hirsutulous upon the veins, but green and glabrous 
upon the surface beneath, 8 to 12 em. long, 2 to 4.5 cm. broad: 
heads terminal, solitary, about 7 cm. broad: no rays observed. — 
Collected between Tlapa and Ayusinapa, Guerrero, Mexico, alt 
tude 1,380 to 1,700 m., 13 December, 1894, #. W. Nelson, no. 
2105, distributed as G. flava. 
var.simulans. Pubescence of the stem coarser, spreading : bases 
of the hairs enlarged, white, tuberculate: leaves somewhat larger, 
less*pubescent, merely cuspidate at the obtusish tip: rays about 13, 
oblong, bright yellow, 3 em. long, 7 to 10 mm. broad. — Collected 
on the Sierra de los Morones near Plateado, Zacatecas, altitude 
2,300 m. 1 September, 1897, Dr. J. N. Rose, no. 2740. This varr 
ety closely simulates Viguiera excelsa, Benth. and Hook.f., which, 
however, differs technically and, as it appears, with constancy !? 
its pubescent achenes which bear at the summit two conspicuous 
awns and some intermediate scales. 
= = Outer involucral bracts much shorter than the large inner ones. 
36. G. PLATYLEPIS, Gray. Hirsute shrub, 1 to 3 m. high: leaves 
chiefly opposite, acuminate or attenuate at each end, very Ss 
brous above, paler and densely soft-pubescent beneath, 1 dm. long, 
3-nerved from considerably above the base: peduncles thickened 
upwards; heads (excl. of rays) 2 to 38cm. in diameter; ligules 
15 to 20 in number, 2 to 3 em. long. — Proc. Amer. acad., 19, 9; 
Klatt, Bull. soc. bot. Belg., 31,199. G. decurrens, Klatt, Leopol- 
dina, 23, 90. Perimeniopsis perfoliata, Sch. Bip., ace. to Klatt, 
l.c. Tithonia scaberrima, Benth. in Oerst., Vidensk. meddel., 
1852, p. 91. 7. platylepis, Sch. Bip., ace. to Benth. and Hook. f., 
Le. 368 (mame only). Mirasolia scaberrima, Benth. and Hook. f. 
