United States (California, Arizona, Nevada); Mexico (Sonora)
Description:
This Mojave and Sonoran desert grassland and shrub-steppe alliance is dominated by the semi-woody perennial grass Pleuraphis rigida often with low cover of Ambrosia dumosa or Larrea tridentata and typically occurs on sandy substrates found on flat ridges, lower slopes, stabilized sand dunes and sandsheets, and sandy plains.