Spider Flower 
Spiderwisp 
Spreading treacle-mustard 
Spreadingpod rockcress 
Spring draba 
Sticky purple cleome 
Stink shepherds tree 
Strigosella africana 
Strigosella trichocarpa 
Strigosella turkestanica 
Sweet alyssum 
Thale cress 
Thoroughwort Pennycress 
Three-horned stock 
Tower Cress 
Tower rockcress 
Tropaeolum adpressum 
Tropaeolum_majus 
Turritis laxa 
Two-leaved Toothwort 
Vasconcellea parviflora 
Violet Cabbage 
Virginia stock 
Wallflower