1907] Hall. Compositae of Southern California. 29 



Heads solitary, terminating corymbose branchlets, campanulate, 30 to 50- 



flowered. 

 Leaves ovate, mostly with broad base. 



Herbage green: leaves sharp-pointed 1. B. atractyloides. 



Herbage white-tomentose : leaves not pointed 2. B. incana. 



Leaves linear to oblong or obovate, with narrow base. 



Inner involucral bracts with acuminate tips: leaves acute, mostly 15 

 to 30 mm. long 3. B. linifolia. 



Inner involucral bracts acute: leaves obtuse, mostly 5 to 15 mm. long 

 4. B. frutescens. 



Heads loosely paniculate or glomerate, turbinate, 5 to 25-flowerd (or perhaps 

 more in no. 5). 



Involucral bracts acute, loose: herbage tomentose 5. B. Nevinii* 



Involucral bracts obtuse, erect: herbage lightly if at all tomentose. 



Heads 10 to 15-flowered: leaves ovate 6. B. Calif ornica^ 



Heads about 5-flowered: leaves lanceolate 7. B. Knappiana* 



1. B. atractyloides Gray, Proc. Am. Acad. viii. 290 (1870). 

 Coleosanthus atractyloides Kuntze, Rev. i. 328 (1891). C. venu- 

 losus A. Nelson, Bot. Gaz. xxxvii. 262 (1904). 



About 3 dm. or less high : stems woody, rigid, with numerous- 

 short twiggy branches: herbage minutely pubescent and usually 

 also glandular, the foliage green and scabrous-atomif erous : 

 leaves rigid-coriaceous, 3-nerved and reticulate-veined, all alter- 

 nate, subsessile, ovate-acuminate, rounded or truncate at base, 

 either entire or with a few spinulose teeth, 1 to 3 cm. long, 7 to 

 20 mm. broad: heads solitary terminating the branchlets; pe- 

 duncle commonly naked and exceeding the leaves, sometimes 

 bracteate near the summit: involucre campanulate, 35 to 50- 

 flowered, 10 to 13 mm. high ; outer bracts green, ovate-acuminate, 

 sometimes broad and toothed like the leaves, scarcely or not 

 shorter than the inner ones ; inner bracts linear-lanceolate, acum- 

 inate. 



Among rocks in the desert ranges: southwestern part of the 

 Colorado Desert, San Diego Co., Apr., 1889, Orcutt; Vallecito, 

 ace. to Parish; San Felipe, San Diego Co., May, 1899, Brande- 

 gee; Palm Springs, Parish, no. 210; Warren's, May, 1902, 

 Brandegee; Cottonwood Springs, Hall, no. 6016 ; northern slope 

 San Bernardino Mts. (borders of Mohave Desert), Parish, no. 

 3710 ; Ord Mts., Hall & Chandler, no. 6775 ; Providence Mts., May,. 



