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



leaves minute and scattered : heads nodding in fruit : outer invo- 

 lucre 2 mm. high. 



In dry sandy soil, Lower Sonoran Zone: Whitewater, Colo- 

 rado Desert, Parish, Schellenger (no. 50) ; Daggett, Mohave Des- 

 ert, and Inyo Co., ace. to Coville; east to Arizona and southern 

 Utah. Also as a waif at East Los Angeles, Davidson. 



38. HYMENOCLEA T. & G. 



Diffusely branched xerophytic shrubs with glabrous or min- 

 utely canescent herbage. Leaves alternate, filiform, entire or the 

 lower parted into filiform lobes. Heads numerous, small, stami- 

 nate and pistillate either intermixed in the panicles or the latter 

 in the lower axils. Involucre of staminate flowers saucer-shaped, 

 commonly 4 to 6-lobed. Pistillate flowers solitary ; the involucre 

 ovoid or fusiform, beaked at apex and winged with broad scarious 

 scales. 



Scales of pistillate involucre spirally alternate, imbricated....!. H. Salsola. 



Pistillate involucre winged only from the middle with a single whorl of 



scales 2. H. monogyra. 



1. H. Salsola T. & G., PL Fendl. 79 (1849). 



An erect bushy shrub, commonly 1 m. high : leaves sparse, .5 

 to 3 (rarely 7) cm. long: scales of the pistillate involucre spirally 

 arranged from the base to near the middle, orbicular and often 

 with a mucro, nearly 5 mm. wide, the margins commonly erose. 



Common in sandy washes and alkaline soil throughout the 

 Lower Sonoran Zone in the Desert Area : Lower California, Palm 

 Springs, Coyote Canon, Mecca, Flowing Wells, Paloverde, Bars- 

 tow, Antelope Valley, and Inyo Co. Also near Bakersfield, Kern 

 Co., Apr. 9, 1893, and Cuyama, Santa Barbara Co., May 6, 1896, 

 both by Miss Eastwood. 



2. H. monogyra T. & G., PI. Fendl. 79 (1849). 



Branches commonly less spreading and more leafy than in 

 no. 1 : scales of the pistillate involucre 7 to 9, in a single whorl 

 around the middle, obovate with a minute mucro, only 1 or 2 mm. 

 wide, the margins erose. 



In washes from Mission Valley, near San Diego, and Lower 

 California east to Arizona and Texas, in the Lower Sonoran Zone. 



