Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Senega paniculata
Root Beer Plant
Seseli libanotis
Moon Carrot
Sherardia arvensis
Field Madder
Silene flos-cuculi
Ragged-Robin
Silene gallica
Small-flowered Catchfly
Silene latifolia
White Campion
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Silene rupestris
Rock Campion
Silene uniflora
Sea Campion
Silene vulgaris
Bladder Campion
Simethis mattiazzii
Kerry Lily
Sison amomum
Stone Parsley
Solanum chenopodioides
Tall Nightshade
Solanum erianthum
Velvet Nightshade
Solanum nigrum
Black Nightshade
Solanum nitidibaccatum
Green Nightshade
Sorbus minima
Least Whitebeam
Spathiphyllum blandum
Pleasant Peace Lily
Spergula arvensis
Corn Spurrey
Spergularia media
Greater Sea-spurrey
Spermacoce hispida
Shaggy Buttonweed