268 PROCEEDINGS OF THE AMERICAN ACADEMY. 



above, densely white-toinentose 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 cm. 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. Rhodbseris conspicua, Turcz. 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, E. 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. Calosei'is rupestris, Benth. PL 

 Hartw. 88 (1841). Pereziopsis Donnell-Smithii, Coulter. Bot. Gaz. 

 xx. 53, t. 6 (1895). Mr. W. Botting Hemsley of the Royal Gardens at 

 Kew has kindly compared for me Heyde 3? 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 involucral bracts, and by the mingling 

 of hirtellous 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-puberu- 

 lent: leaves sessile, amplexicaul, ovate-oblong, in specimens at hand 2.5 

 to 7 cm. long, 1 to 4 cm. broad, acute, unequally and subspinosely dentate, 

 slightly hirtellous above, glandular-hirtellous and rather prominently 

 reticulate-veined beneath : inflorescence a terminal corymb or corymbose 

 panicle, leafy : heads mostly short-pedunculate, 12 to 16 mm. high, about 

 25-flowered : involucre narrowly campanulate ; bracts of the involucre 

 imbricated in 5 to 6 series, linear-oblong to lanceolate, 4 to 8 mm. long, 

 the outer bracts successively shorter, squarrose, mostly herbaceous, slightly 

 expanded at the tips and mucronate, hirtellous-puberulent, the inner 



