Reseda stenostachya 
Ricotia cretica 
Ricotia lunaria 
Round-leaved Pennycress 
Sacred Garlic Pear 
Sad Stock 
Saharan Mustard 
Salvadora angustifolia 
Sand fringepod 
Sanddune wallflower 
Savignya parviflora 
Schimpera arabica 
Schouwia purpurea 
Scurvygrass 
Sea kale 
Sea Stock 
shepherd's cress 
Shepherd's-Purse 
Shepherds purse 
Simple Leaved Clammyweed 
Sisymbrium septulatum 
Slender toothwort 
Smooth mustard 
Southern bittercress