1907] Hall.Compositae of Southern California. 49 



Pass ; Ken worthy, San Jacinto Mts. ; Coyote Canon ; San Felipe 

 and "Witch Creek, San Diego Co. ; San Pedro Martir, Lower Cali- 

 fornia, Brandegee; Arizona to Utah. Along the western limits of 

 its range the variety passes directly into the species, and certain 

 specimens from Mt. Diablo, which is presumably near the type 

 locality of 8. linearifolius, have the short leaves and small heads 

 of the variety, these characters apparently varying from year 

 to year with climatic conditions. The bracts of the peduncle are 

 often subulate in otherwise typical linearifolius, and the in- 

 volucral bracts are seldom less than acuminate in the variety. 



13. HAPLOPAPPUS Cass. 



Annual or perennial herbs or low shrubs. Heads mostly 

 rather large, hemispheric, in terminal cymose or paniculate 

 clusters or solitary, rarely sessile. Involucre imbricated, its 

 bracts mostly with green or herbaceous tips. Rays present, yel- 

 low. 'Disk-flowers permanently yellow. Style-branches various. 

 Achenes of the ray usually fertile, both these and the disk-achenes 

 slightly or not at all compressed. Pappus of numerous unequal 

 dull-white or reddish bristles. 



Herbage loosely tomentose: Transition Zone species 1. H. gossypinus. 



Herbage glabrous or canescent: Sonoran species. 



Annual: stems leafy 2. H. gracilis. 



Perennial: stems reedy, leaves reduced 3. H. junceus. 



1. H. gossypinus (Greene) Hall, comb. nov. Pyrrocoma 

 gossypina Greene, Pitt. iii. 23 (1896). 



Stems several, from a thick often fusiform perennial caudex, 

 decumbent or erect. 1.5 to 2 dm. high : herbage tomentose when 

 young, the tomentum deciduous except from the axils of the 

 lower leaves : basal leaves numerous, oblanceolate or linear- 

 oblanceolate, entire or serrate, acute, 2 to 12 cm. long includ- 

 ing the petiole ; cauline leaves narrow, 3 cm. or less long, entire : 

 heads racemose or solitary terminating the simple stems: in- 

 volucre hemispheric, 10 to 12 mm. high, loosely imbricated; 

 bracts linear-acuminate, without distinct green tips: rays about 

 20, clear yellow, 7 mm. long: achenes (nearly mature) oblong, 

 very canescent. 



