Sea Bean 
Securidaca volubilis 
Senegalia gaumeri 
Senna bicapsularis 
Senna didymobotrya 
Senna italica 
Senna pendula 
Sensitive Plant 
Sharp-tooth Clover 
short-flower bird's-foot-trefoil 
Showy Parrot-Pea 
Showy tick-trefoil 
Showy wattle 
Shrub lespedeza 
Shrubby Deervetch 
Shrubby milkwort 
Shyleaf 
Sidebeak pencilflower 
Silky Lupine 
Silver Wattle 
Silvery Lupine 
Slender birdsfoot trefoil 
Slender bush clover 
Slender bush-pea