Rorippa sylvestris
Creeping Yellow-cress
Rubia peregrina
Wild Madder
Rumex maritimus
Golden Dock
Salix repens
Creeping Willow
Saxifraga aizoides
Yellow Saxifrage
Sedum acre
Biting Stonecrop
Sedum sexangulare
Tasteless Stonecrop
Senecio cambrensis
Welsh Groundsel
Senecio inaequidens
Narrow-leaved Ragwort
Senecio sarracenicus
Broad-leaved Ragwort
Senecio squalidus
Oxford Ragwort
Senecio sylvaticus
Heath Groundsel
Senecio viscosus
Sticky Groundsel
Senecio vulgaris
Groundsel
Sinapis alba
White Mustard
Sinapis arvensis
Charlock
Sisymbrium officinale
Hedge Mustard
Smyrnium olusatrum
Alexanders
Solanum nigrum
Black Nightshade
Solidago canadensis
Canadian Goldenrod
Solidago gigantea
Early Goldenrod
Solidago virgaurea
Goldenrod
Sonchus arvensis
Perennial Sow-thistle
Sonchus oleraceus
Smooth Sow-thistle