Dee's * 7 
268 PROCEEDINGS OF THE AMERICAN ACADEMY. 
above, densely white-tomentose beneath; the terminal and lateral seg- 
ments prolonged into a stoutish straw-colored spine: heads solitary, ter- 
minating the stem and branches, large: involucre 5 to 6 em. high; 
bracts of the involucre disposed in many series, essentially uniform, nar- 
rowly lance-attenuate, 2.5 to 5 cm. in length, spiny tipped, entire or 
sparingly spinose-margined, somewhat glabrate on the back, deep purple 
in color, the outer successively shorter: flowers apparently white or 
slightly purplish: mature achenes oblong, 5 to 6 mm. long, glabrous. — 
Mexico. State of Puebla: in pine forests, Honey Station, altitude 
1765 m., 15 September, 1904, C. G. Pringle, no. 8884 (hb. Gr.) 
This species is one of the most showy of the genus and is easily 
recognized among all known American species on account of the very 
large heads, the narrow lance-attenuated deep purple essentially uniform 
bracts of the involucre, 
Onoseris conspicua, n. comb. Rhodoseris conspieua, Turez. Bull. 
Soc. Nat. Mosc. xxiv. pt. 2, 95, t. 2 (1851); Hemsl. Biol. Cent.-Am. 
Bot. ii. 254 in synonymy.— Mexico. Sierra San Pedro, Nolasco, Jur- 
gensen. State of Oaxaca: near Plumia, altitude 1000-1500 m., 17 March, 
1895, H. W. Nelson, no. 2480 (hb. Gr.). The few-flowered heads and 
the long involucre are important diagnostic characters of this species. 
Onoseris rupestris, n. comb. Caloseris rupestris, Benth. Pl. — 
Hartw. 88 (1841). Pereziopsis Donnell-Smithii, Coulter. Bot. Gaz. 
xx. 93, t. 6 (1895). Mr. W. Botting Hemsley of the Royal Gardens at 
Kew has kindly compared for me Heyde & Lux no, 4527, exsiccatae John 
Donnell Smith, with the original of Caloseris rupestris, Benth., and states 
that the two plants are conspecific. The species is characterized especially 
by the long involucre, the purplish inyolucral bracts, and by the mingling 
of recline hairs with the arachnoid tomentum of the peduncles. O. ru- 
pestris is easily separated from O. Isotypus, Benth. & Hook. f., with 
which it has been confused by having a much longer involucre. 
Perezia Lozani, n. sp. Stem striate, purplish, hirtellous-pubeitae 
lent: leaves sessile, amplexicaul, ovate-oblong, in specimens at han 2.5 
to 7 cm. long, 1 to 4 cm. broad, acute, scamualte and subspinosely dentate, 
slightly hirtellous above, glandular-hirtellous and rather prominently * 
reticulate-veined beneath : inflorescence a terminal corymb or corymbose p 
panicle, leafy : heads mostly short-pedunculate, 12 to 16 mm. high, about — 
_20-flowered: involucre narrowly campanulate; bracts of the involucre . 
imbricated in 5 to 6 series, Hpear-oblong to lanceolate, 4 to 8 mm. long; 
the outer y shorter, squarrose, mostly herbaceous, slightly : 
expanded at the tips and mucronate, hirtellous-puberulent, the inper 
