Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Seseli libanotis
Moon Carrot
Sherardia arvensis
Field Madder
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 nigrum
Black Nightshade
Solanum nitidibaccatum
Green Nightshade
Spergula arvensis
Corn Spurrey
Spergularia media
Greater Sea-spurrey
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Stachys palustris
Marsh Woundwort
Staphylea pinnata
Bladdernut
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed