Small-fruited Clover 
Smallhead clover 
Smooth Parrot-pea 
Smooth Tare 
Smooth yellow vetch 
Snail Vine 
Soft Butterfly-Pea 
Sophora alopecuroides 
Sophora microphylla 
Southern Bird's-Foot-Trefoil 
Spanish Broom 
Spanish Clover 
Spatulate Vetchling 
Spiked Hoarypea 
Spiny bossiaea 
Spiny Broom 
Spiny restharrow 
Spiny wattle 
Spring vetch 
Spurred Butterfly Pea 
Spurwing Wattle 
Star-fruited Medick 
Sticky Restharrow 
Stink Bean