Sainfoin 
Sampson's snakeroot 
Sand Mora 
Scarlet Powder-Puff 
Scarlet runner bean 
Scorpion senna 
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