Desert Plains 



A. Bouteloua-Aristida association, Sweetwater, Texas. 



B. Bouteloua gracilis, Scleropogon brevifolius, and Httaria mutica valley, B, < 



gracilis, racemosa hills. Van Horn. Texas. 



C. Bovieloua 'inn His, hirsuta, eriopoda, and Aristida dicar Iraki, Jornada Reserve, Las 



Cruces, New Mexico. 



