Sparaxis, Harlequin Flower
Spathe Leaved Sedum
Spear Lily
Spice Bush
Spike Gayfeather
Spineless Yucca
Spiny Rush
Spoon-Yucca
Spreading Acacia
Spreading English Yew
Sprenger Asparagus
Spring Cinquefoil
Spurge
St. Catherine's Lace
Stalked Aeonium
Standard Rose
Star Jasmine, Confederate Jasmine
Star Magnolia
Sticks on Fire, Pencil Tree
Sticky Monkey Flower