Soapberry
Soaptree Yucca
Sonoran Palo Verde, 'AZT'
Sonoran tree bear grass
Southern Magnolia, Bull Bay
Southwestern Cosmos
Spanish Bayonet
Spanish Broom
Spanish Dagger
Spanish Dagger, Palma Pita
Spartan Columnar Juniper
Spider Agave
Spineless Yucca
Spotted Emu Bush
Sprawling Prickly Pear
Spreading Acacia 'Desert Carpet'
Spreading Fleabane
Sprucetop Grama
Squawbush, Skunkbush, Three Leaf Su
Star Jasmine