Silver Cloud Silverleaf
Silver Dollar Gum
Silver Leaf Senna
Slipper Flower
Small Soapweed
Smooth Agave
Soap Aloe
Soaptree Yucca
Sonoran Palo Verde, 'AZT'
Sonoran tree bear grass
Southwestern Cosmos
Spanish Bayonet
Spanish Dagger
Spider Agave
Spider Aloe
Spineless Yucca
Spotted Emu Bush
Sprawling Prickly Pear
Spreading Acacia 'Desert Carpet'
Spreading Fleabane