1907] HallCompositae of Southern California. 137 



with the margins of the achenes, much thickened below and about 

 as long as the disk-corollas. 



Very common in sandy soil of the Lower Sonoran Zone on 

 both the Colorado and Mohave deserts, where large areas are 

 rendered brilliant by its showy yellow heads in good seasons ; east 

 into Arizona and Nevada. 



5. E viscida Gray, Proc. Am. Acad. xi. 78 (1876). 



Somewhat branching, 3 to 6 dm. high, leafy up to the usually 

 short simple peduncles: herbage viscid-glandular and hirsutely 

 villous : cauline leaves 6 to 8 cm. long, ovate to oblong, obtuse or 

 acute, clasping, entire or more often sharply toothed: involucre 

 12 to 15 mm. high and fully as broad : achenes narrowly cuneate, 

 truncate between the awns. 



Near Campo in the mountains of southern San Diego Co., 

 Palmer, ace. to Gray, Parish, no. 242 ; Abrams, no. 3633, Brande- 

 gee; Lower California. Lower leaves and base of stem unknown. 



49. VERBESINA L. 



Ours erect branching annuals with simple dentate or entire 

 leaves. Heads on more or less elongated peduncles. Involucre 

 hemispheric or campanulate, its ovate to linear bracts in several 

 series. Receptacle usually conical; its bracts concave, folded 

 about the outer edge of the achenes. Both disk and ray yellow in 

 our species. Achenes strongly compressed laterally, usually ob- 

 long or obovate, winged on each edge. Pappus of two awns, one 

 to each edge of the achene. 



Leaves sessile, green on both sides 1. F. dissita. 



Leaves petioled, canescent at least beneath. 



Disk-achenes broadly winged, pubescent: var. exauriculata of 



2. F. encelioides. 



Disk-achenes narrowly winged, glabrate 3. F. australis. 



1. V. dissita Gray, Proc. Am. Acad. xx. 299 (1885). 



Tall, probably from a suffruteseent perennial base: herbage 

 ^reen and nearly glabrous, only the leaves obscurely scabrous and 

 the involucres cinereous : leaves thin-membranous, remote, mostly 

 opposite, sessile or short-petioled, ovate, serrate or entire, 4 to 8 

 cm. long: heads short-peduncled, few in a terminal panicle: in- 



