122 University of California Publications in Botany. [VOL. 3 



Habit, pubescence, etc. of G. bipinnatifida but the leaves 

 narrowly ovate or obovate with cuneate base and merely serrate, 

 or the lower laciniate or incised or even pinnately parted into 

 oblong divisions which are again lobed; bur thicker, sparsely 

 hirsute, the spines broader and channeled. 



San Miguel Island, Sept., 1886, Greene; San Clemente Island, 

 Mrs. Trask (leaves only) ; seaboard of middle California to 

 Washington. 



F. CAMPHORATA Greene, Bull. Calif. Acad. i. 192 (1885), of 

 Lower California, may reach our southern border. It is much 

 like F. bipinnatifida but the burs are globose, with short stout 

 spine-tipped tuberculations which are not at all flattened : herbage 

 resinous and with the odor of camphor. 



5. F. dumosa Gray, Frem. 2nd. Kept. 316 (1845). Gaert- 

 neria dumosa Kuntze, 1. c. SAND-BUR. 



A low spreading shrub, seldom over 5 dm. high, with rigid 

 and brittle branches: herbage whitened with a fine close pubes- 

 cence: leaves small (commonly 1 or 2 cm., rarely 4 cm. long), 

 pinnately parted into few short very obtuse lobes : fertile invo- 

 lucre mostly 2-flowered, glabrous or pubescent, globular, its spines 

 tapering from a broad flat base to a straight acerose tip. 



Abundant on the Colorado and Mohave deserts ; east to Utah 

 and south into Mexico ; a characteristic species of the Larrea belt 

 of the Lower Sonoran Zone. 



6. F. chenopodiifolia Benth., Bot. Sulph. 26 (1844). 

 Plant low, much branched, the stems woody only at base : 



herbage pubescent with a very close and soft tomentum, the 

 upper surface of the leaves glabrate : leaves round-ovate, obtuse, 

 the base varying from almost truncate to cuneate, sinuate-crenate 

 to obtusely dentate, 1.5 to 3 cm. long, on margined petioles 1 or 2 

 cm. long: fertile involucre globular, 2 or 3-flowered, arachnoid 

 between the spines, these lanceolate-subulate and hooked at 

 the tip. 



Tia Juana, San Diego Co., Apr., 1902, Grant, no. 1637; Apr., 

 1903, Hall, no. 3974; May 14, 1903, Abrams, no. 3476: Lower 

 California, Orcutt, Greene, Palmer, Brandegee, Barkelew, Pur- 

 pus. Apparently a Lower Sonoran species. 



