136 University of California Publications in Botany. [ V L - 3 



in foliage and pubescence but has an entirely different inflores- 

 cence, the simple scabrous peduncles terminating leafy branchlets. 



3. E. farinosa Gray, Emory Eept. 143 (1848). INCIENSO. 

 Plant 3 to 5 dm. high, commonly with a distinct trunk-like 



stem, the numerous short branches forming a round-topped leafy 

 bush from the summit of which arise the long-stemmed cymes : 

 leaves broadly ovate, acute or obtuse, 2 to 5 or 10 cm. long, nar- 

 rowed to the petiole, whitened by the dense silvery tomentum : 

 heads cymose, the branches of the cyme perfectly smooth and 

 naked except for a few minute bracts : involucre rather sparsely 

 pubescent, 5 to 8 mm. high : rays 8 to 18, 1 to 1.5 cm. long : disk 

 yellow, 1 or 2 cm. broad : lobes of disk-corollas glabrous : pappus 

 none. 



Plentiful in the San Bernardino Valley, thence south to 

 western San Diego Co. and Lower California, east into Arizona, 

 and north to Death Valley: very common on benches and low 

 mountains of the Colorado Desert, probably much less common 

 on the Mohave but not rare at Newberry and collected near Death 

 Valley by Coville: chiefly in the Lower Sonoran Zone. In Lower 

 California this plant is known as Incienso because of the custom 

 of collecting and burning the resinous exudation as an incense in 

 the churches. 28 This cognomen may well be accepted as its 

 common name. 



4. E. eriocephala Gray, Proc. Am. Acad. viii. 657 (1873). 

 Simsia canescens Gray, PI. Fendl. 85 (1849) ; not Encelia canes- 

 cens Cav., Ic. i. 45 (1791). DESERT SUNFLOWER. 



Annual, from 1 to fully 6 dm. high, usually with several erect 

 branches from the base: herbage hirsute with long white hairs, 

 rarely glabrate above : leaves mainly toward the base, 3 to 10 cm. 

 long, ovate or lanceolate to obovate, acute, narrowed to the short 

 margined petiole, few-toothed or entire: heads 1 to several, on 

 short peduncles terminating long leafless branches or more numer- 

 ous in an open panicle : involucre 7 to 10 mm. high, its lanceolate- 

 acuminate bracts green but the margins and base very white with 

 a long villous pubescence: rays variable, commonly 12 to 16 in 

 number and 1 or 2 cm. long : pappus of 2 stout awns, continuous 



ssBrandegee, Zoe i. 83 (1890). 



