Scrophularia umbrosa
Green Figwort
Sedum forsterianum
Rock Stonecrop
Sedum rosea
Roseroot
Sedum telephium
Orpine
Senecio sarracenicus
Broad-leaved Ragwort
Senecio vernalis
Eastern Groundsel
Sequoiadendron giganteum
Wellingtonia
Seseli libanotis
Moon Carrot
Silene conica
Sand Catchfly
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Silene uniflora
Sea Campion
Silene vulgaris
Bladder Campion
Soldanella alpina
Alpine Snowbell
Solidago canadensis
Canadian Goldenrod
Solidago virgaurea
Goldenrod
Sorbus minima
Least Whitebeam
Spergularia rubra
Sand Spurrey
Sphagnum denticulatum
Cow-horn Bog-moss
Stellaria holostea
Greater Stitchwort
Stigmella anomalella
Stigmella assimilella
Tanacetum vulgare
Tansy
Thesium humifusum
Bastard-toadflax