Ruellia tuberosa
Minnieroot
Rumex acetosa
Common Sorrel
Salix pentandra
Bay Willow
Sambucus ebulus
Dwarf Elder
Scleranthus perennis
Perennial Knawel
Scrophularia auriculata
Water Figwort
Scutellaria minor
Lesser Skullcap
Sedum anglicum
English Stonecrop
Senecio cambrensis
Welsh Groundsel
Senecio sarracenicus
Broad-leaved Ragwort
Senecio squalidus
Oxford Ragwort
Serratula tinctoria
Saw-wort
Sida acuta
Common Wireweed
Silaum silaus
Pepper-saxifrage
Silene chalcedonica
Maltese-Cross
Silene flos-cuculi
Ragged-Robin
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Simethis mattiazzii
Kerry Lily
Sinapis arvensis
Charlock
Solanum dulcamara
Bittersweet
Sonchus oleraceus
Smooth Sow-thistle
Sorbus torminalis
Wild Service-tree
Spergularia rubra
Sand Spurrey