FLOWERING PLANTS AND FERNS OF ARIZONA 273 



17. Atriplex confertifolia (Torr. and Frem.) S. Wats., Amer. Acad. 



Arts and Sci. Proc. 9: 119. 1874. 



Obione confertifolia Torr. and Frem. in From., Exped. Rocky 

 Mount. Rpt. 318. 1845. 



Apache, Navajo and Coconino Counties, 4,200 to 5,700 feet, dry 

 plains and mesas, usually forming small hummocks. North Dakota to 

 Oregon, south to Chihuahua, northern Arizona, and California. 



Shadscale, sheepfat, spiny saltbush. In the northern part of the 

 State shadscale often occurs over large areas in pure stands, crowding 

 out nearly all other plants. It has the ability to resist overgrazing. 

 A. collina Woot. and Standi., the type of which was collected in the 

 Carrizo Mountains, Apache County (Standley 7481), differs from 

 typical A. confertifolia in having dentate fruiting- bracts, but there 

 seems to be complete intergradation. 



18. Atriplex linearis S. Wats., Amer. Acad. Arts and Sci. Proc. 24: 



72. 1889. 



Atriplex canescens subsp. linearis Hall and Clements, Carnegie 

 Inst. Wash. Pub. 326: 344. 1923. 



Pinal, Maricopa, Pima, and Yuma Counties, 2,300 feet or lower, in 

 dry saline soil. Arizona, southeastern California, Sonora, and Baja 

 California. 



19. Atriplex canescens (Pursh) Xutt., Gen. PL 1: 197. 1818. 



CaUigonum canescens Pursh, Fl. Amer. Sept. 370. 1814. 



Throughout the State, 6,500 feet or lower, commonly in sandy, 

 sometimes in saline, soil. South Dakota to Oregon, south to northern 

 Mexico. 



Fourwing saltbush, cenizo, chamiso, chamiza, often erroneously 

 called "shadscale" and "sagebrush." This plant is adapted to very 

 diverse soil and climatic conditions and is found in association with 

 creosotebush, sagebrush, pinyon, and sometimes yellow pine. It is 

 highly prized as a browse plant, and the fruits are so relished by live- 

 stock that reproduction is often greatly hindered. The plant is 

 deep-rooted and should be useful for erosion control. 



20. Atriplex garrettii Rydb., Torrey Bot. Club Bui. 39: 312. 1912. 



Atriplex canescens subsp. garrettii Hall and Clements, Carnegie 

 Inst. Wash. Pub. 326: 344. 1923. 



Lees Ferry and vicinity (Coconino County), about 3,500 feet. 

 Western Colorado, eastern Utah, and northern Arizona. 

 The plant is not unlike A.jonesii in general appearance. 



Atriplex nuttallii S. Wats., both subsp. typica Hall and Clements and subsp. 

 cuneata (A. Nels.) Hall and Clements, have been reported from Arizona, but the 

 writers have no satifactory evidence that either form occurs in the State. The 

 species bears considerable resemblance to A. jonesii Standi. 



6. ZUCKIA 



A low erect shrub, pubescent with inflated whitish hairs; leaves 

 alternate, petioled, entire; flowers dioecious, the pistillate ones without 

 perianth, bibracteolate, sessile, solitary or in small clusters, forming 



