Scleranthus annuus
Annual Knawel
Scleranthus perennis
Perennial Knawel
Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Sedum anglicum
English Stonecrop
Serratula tinctoria
Saw-wort
Sibthorpia europaea
Cornish Moneywort
Silaum silaus
Pepper-saxifrage
Silene conica
Sand Catchfly
Silene dioica
Red Campion
Silene flos-cuculi
Ragged-Robin
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Silene viscaria
Sticky Catchfly
Sinapis arvensis
Charlock
Sisymbrium officinale
Hedge Mustard
Smyrnium perfoliatum
Perfoliate Alexanders
Solanum dulcamara
Bittersweet
Sorbus aucuparia
Rowan
Spartina anglica
Common Cord-grass
Spergula arvensis
Corn Spurrey
Stachys germanica
Downy Woundwort
Staphylea pinnata
Bladdernut
Stellaria alsine
Bog Stitchwort