110 PROCEEDINGS OP THE AMERICAN ACADEMY. 



yellow, 8 mm. long, one-half as broad, longer than the slender sterile 

 achene : disk-flowers numerous, about 50 ; corollas pale yellow or some- 

 times slightly tinged with purple: mature achenes 5 mm. long, 3 mm. 

 broad. — Mexico. State of Jalisco: fields and copses, Tequila, Septem- 

 ber-October, 1893, C. G. Pringle, no. 4G02 (hb. Gr.). State of Guerrero : 

 between Tlapa and Tlaliscatilla, altitude 1200 to 1400 in., 5 December, 



1894, E. W. Nelson, no. 2045 (hb. Gr., and hb. U. S. Nat. Mas.). State 

 of Oaxaca: hills of Soledad de Etla, altitude 1850 in., 19 November, 



1895, L. C. Smith, no. 894 (hb. Gr.). 



This species has hitherto been confused with Encelia mexicana, Mart., 

 and Mr. Pringle's specimen above cited was distributed as " Encelia 

 mexicana, Mart., var." From that species, however, E. adenophora is 

 amply distinct, being readily separated by the pale yellow color of the 

 entire plant, the larger, more numerously flowered heads, the attenuated 

 involucral scales, and finally by the copious stipitate-glandular hairs of 

 stem, leaves and inflorescence. 



Encelia angustifolia. An herbaceous perennial : stem simpte, erect 

 from a ligneous base, 3 to 4 dm. high, glabrous, striate, more or less 

 purplish : leaves alternate or scattered, linear or linear-lanceolate, 1.5 to 8 

 cm. long, 1.5 to 3 mm. broad, acute or acutish, remotely and inconspicu- 

 ously serrulate, appressed-hirtellous above, glabrous beneath, 3-nerved ; 

 nerves rather prominent especially on the lower leaf-surface : heads 

 radiate, about 1 cm. high, excluding the rays about 6 mm. in diameter, 

 terminating the stems on slender peduncles: involucre 1—2 -seriate ; 

 bracts of the involucre lance-linear, subequal, shorter than the flowers of 

 the disk : ray-flowers about 5; rays narrowly oblong, 10 to 12 mm. long, 

 yellow : disk-flowers comparatively few : achenes strongly compressed 

 laterally, ciliate-margined. — Mexico. Territory of Tepic : in the 

 Sierra Madre, 13 August, 1897, Dr. J. N. Rose, no. 3453 (hb. Gr., and 

 hb. U. S. Nat. Mus.). 



A very characteristic species, which on account of the narrow attenu- 

 ated leaves and the few heads, is easily distinguished from all the de- 

 scribed species of the genus. 



Encelia collodes. Suffruticose : stem covered with a brownish bark : 

 branches striate, or striate-angled puberulent or essentially glabrous : 

 leaves alternate, petiolate, lanceolate or oblong-lanceolate, 5 to 12 cm. 

 long, 1.5 to 5 cm. broad, acuminate, acute, entire, narrowed at the base 

 into a 0.5 to 1.5 cm. long petiole, glabrous above, puberulent on the 

 prominent midrib and nerves beneath, firm in texture: inflorescence a 

 terminal few-headed subcorymbose cyme : heads rather large, pedun- 



