Scutellaria galericulata
Skullcap
Scutellaria minor
Lesser Skullcap
Sedum acre
Biting Stonecrop
Selenia tetralunaria
Purple Thorn Moth
Senecio squalidus
Oxford Ragwort
Senecio viscosus
Sticky Groundsel
Sequoia sempervirens
Coastal Redwood
Sequoiadendron giganteum
Wellingtonia
Serratula tinctoria
Saw-wort
Sibthorpia europaea
Cornish Moneywort
Silaum silaus
Pepper-saxifrage
Silene uniflora
Sea Campion
Smyrnium olusatrum
Alexanders
Solanum dulcamara
Bittersweet
Solanum nigrum
Black Nightshade
Solidago virgaurea
Goldenrod
Sonchus asper
Prickly Sow-thistle
Sorbus aria
Common Whitebeam
Sorbus aucuparia
Rowan
Sorbus minima
Least Whitebeam
Sorbus stenophylla
Llanthony Whitebeam
Sorbus torminalis
Wild Service-tree
Sparganium erectum
Branched Bur-reed
Sparganium natans
Least Bur-reed