Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Sedum anglicum
English Stonecrop
Senecio sylvaticus
Heath Groundsel
Senecio viscosus
Sticky Groundsel
Senecio vulgaris
Groundsel
Serratula tinctoria
Saw-wort
Silaum silaus
Pepper-saxifrage
Silene gallica
Small-flowered Catchfly
Silene noctiflora
Night-flowering Catchfly
Silene viscaria
Sticky Catchfly
Silene vulgaris
Bladder Campion
Sinapis alba
White Mustard
Sinapis arvensis
Charlock
Sisymbrium officinale
Hedge Mustard
Sisyrinchium bermudiana
Blue-eyed-grass
Smyrnium olusatrum
Alexanders
Solanum chenopodioides
Tall Nightshade
Solanum dulcamara
Bittersweet
Solanum nigrum
Black Nightshade
Solanum nitidibaccatum
Green Nightshade
Solidago virgaurea
Goldenrod
Sonchus arvensis
Perennial Sow-thistle
Sorbus aria
Common Whitebeam