Silver King Euonymus
Silver Maple
Silverberry, Thorny Elaeagnus
Small Flower Tamarisk
Small Soapweed
Smoketree, Wigtree
Smooth Agave
Snow-In-Summer
Soaptree Yucca
Society Garlic
Sonoran tree bear grass
Southern Sword Fern
Southwestern Cosmos
Spanish Lavender
Spartan Columnar Juniper
Spider Agave
Spike Gayfeather
Spike Lavender
Spineless Yucca
Spotted Emu Bush