Salix viminalis
Osier
Samolus valerandi
Brookweed
Saxifraga aizoides
Yellow Saxifrage
Schoenus nigricans
Black Bog-rush
Scirpus sylvaticus
Wood Club-rush
Scrophularia auriculata
Water Figwort
Scutellaria galericulata
Skullcap
Scutellaria minor
Lesser Skullcap
Selaginella selaginoides
Lesser Clubmoss
Senecio sarracenicus
Broad-leaved Ragwort
Silene flos-cuculi
Ragged-Robin
Solanum dulcamara
Bittersweet
Sparganium erectum
Branched Bur-reed
Spiranthes romanzoffiana
Irish Lady's-tresses
Stachys palustris
Marsh Woundwort
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed
Stellaria palustris
Marsh Stitchwort
Symphytum officinale
Common Comfrey
Thalictrum flavum
Common Meadow-rue
Thelypteris palustris
Marsh Fern
Tofieldia pusilla
Scottish Asphodel
Triglochin palustris
Marsh Arrowgrass
Trocdaris verticillata
Whorled Caraway