Larrea tridentata
Dominant plants in the valleys are low shrubs such as "Ambrosia dumosa" (white bursage) and "Larrea tridentata" (creosote bush). Over half of the floral diversity comprises annual species, with even higher percentages in drier habitats. Vulnerable species and plant communities include saltbush/wolfberry flats, saguaro, nightblooming cereus cacti, tamarisks, barrel cactus, Sonoran panicgrass, and Acuna cactus.