STANDLEY TREES AND SHRUBS OF MEXICO. 251 



Plants tall shrubs, usually a meter high or more ; leaves neitner obo- 

 vate nor orbicular. 

 Bracts crenulate ; leaves petiolate, the blades 1.5 to 5 cm. long. 



8. A. lentiformis. 

 Bracts laeiiiiute-deutate; leaves sessile, usually less than 1 cm. long. 



9. A. polycarpa. 

 Plants low shrubs, rarely GO cm. high or, if larger, the leave.< obovate 

 or orbicular. 



Bracts 2 to 3 mm. long 10. A. insularis. 



Bracts 4 to 10 mm. long. 



Bracts 4 to 8 mm. long, broader than long 11. A. obovata. 



Bracts 8 to 10 mm. long, longer than broad 12. A. pringlei. 



1. Atriplex canescens (Pursh) Nutt. Gen. PI. 1: 197. 1818. 

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

 Obione tetraptera Benth. Hot. Voy. Sulph. 48. 1844. 

 Ohione lerlandieri Moq. in DC Prodr. 13 ^: 114. 1849. 



Baja California to Coahuila, San Luis Potosi, and Zacateca.s. Northward in 

 the United States to Oregon and South Dakota ; type from South Dakota. 



Densely branched, grayish shrub, usually 1 to 1.5 meters high, often forming 

 broad clumps ; leaves mostly linear, obtuse ; flowers dioecious. " Costillas de 

 vaca " (Zacatecas) ; " chamiso " (Baja California, Chihuahua, New Mexico); 

 " cenizo " (Chilmahua, Sonora). 



In some parts of its range this plant, like others of the genus, is of some 

 importance as a forage plant. The leaves have a salty flavor. The seeds of 

 this and other species have been used as food by the Gosiute Indians of Utah. 



2. Atriplex linearis S. Wats. Proc. Amer. Acad. 24: 72. 1889. 



Dry plains and hillsides, Sonora and Baja California : type from Guaymas. 

 Southern Arizona and California. 



Dense shrub, 1 to 2.5 meters high ; leaves linear. 1 to 5 cm. long, whitish. 

 "Chamiso" (Baja California). 



3. Atriplex macropoda Rose & Standi. N. Amer. Fl. 21: 72. 1916. 



Known only from the type locality, Pichilinque li^land, Baja California. 

 Shrub with slender branches ; leaves linear, 1 to 1.8 cm. long. 



4. Atriplex niatamorensis A. Nels. Proc. Biol. Soc. Wasliiiigton 17: 99. 1904. 

 Atriplex opposififoUa S. Wats. Proc. Amer. Acad. 9: 118. 1874. Not A. oppo- 



sitifolia Vill. 1779. 



Tamaulipas; type from the Rio Grande Valley, near Matamoros, South- 

 western Texas. 



Small shrub, 20 to 40 cm. high, with slender, very leafy branches ; leaves 

 sessile, lance-oblong, 2 to 5 mm. long, entire, obtuse or acutish ; bracts sub- 

 orbicular, 3 mm. long, dentate. 



5. Atriplex acanthocarpa (Torr.) S. AVats. Proc. Amer. Acad. 9: 117. 1874. 

 Ohione acanthocarpa Torr. U. S. & Mex. Bound. Bot. 183. 1859. 

 Chihuahua to Nuevo Leon. AVestern Texas and southern New Mexico ; type 



from plains near the Burro Mountains, New Mexico. 



Shrub. 1 meter high or less ; leaves oblong to broadly obovate, 1.5 to 5 cm. 

 long, coarsely dentate ; flowers monoecious ; bracts 7 to 15 mm. long, the mar- 

 gins laciniate. the sides with numerous long flattened appendages. 



6. Atriplex julacea S. Wats. Proc. Amer. Acad. 20: 370. 1885. 

 Baja California ; type from Bahia de Todos Santos. 



Procumbent or erect shrub, the slender branches densely leafy ; leaves scale- 

 like; flowers dioecious; bracts 4 to 5 nun. long, with corky appendages on the 

 sides. 



