Apr. 12,1924 Vegetation in the Semiarid Portion of the United States . 127 
Region 15 
(36) Hilaria rigida. 
(37) Tussock grass. 
(60) Coleogyne. 
(65) Saltgrass. 
(66) Pickle weed. 
(69) Creosotebush. 
(70) Creosotebush and bur-sage. 
(71) Encelia and' California sage¬ 
brush. 
(72) Shrub buckwheat. 
(73) Desert brush type. 
(75) Creosotebush and cacti. 
(76) Creosotebush-ocotillo. 
(77) Giant cactus and bur-sage. 
(78) Mesquite. 
(81) Parosela arborescens and Lepido - 
spartum squamatum. 
(82) Pluchea. 
(83) Atriplex lentiformis. 
(84) Desert sage. 
