Scorzoneroides cichoriacea 
Sea aster 
Sea Mayweed 
Sea Wormwood 
Seaside fleabane 
Seaside Woolly Sunflower 
Securigera parviflora 
Senecio de Saladar 
Senecio doriiformis 
Senecio flavus 
Senecio formosus 
Senecio glaucus 
Senecio integerrimus 
Senecio leucanthemifolius 
Senecio nemorensis 
Senecio niveoaureus 
Senecio pinnatifolius 
Senecio serpens 
Senecio vernalis 
Shaggy Blazing Star 
Shaggy soldier 
Sheeps bit scabious 
Shepherd's needles 
Showy Goldenrod