Saxifraga tridactylites
Rue-leaved Saxifrage
Scabiosa columbaria
Small Scabious
Schedonorus giganteus
Giant Fescue
Scheuchzeria palustris
Rannoch-rush
Scleroderma aerolatum
Leopard Earthball
Scrophularia umbrosa
Green Figwort
Scutellaria galericulata
Skullcap
Senecio sarracenicus
Broad-leaved Ragwort
Senecio vernalis
Eastern Groundsel
Sequoiadendron giganteum
Wellingtonia
Seseli libanotis
Moon Carrot
Setaria viridis
Green Bristle-grass
Silene conica
Sand Catchfly
Silene gallica
Small-flowered Catchfly
Silene latifolia
White Campion
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Silene uniflora
Sea Campion
Silene vulgaris
Bladder Campion
Sisyrinchium bermudiana
Blue-eyed-grass
Solanum chenopodioides
Tall Nightshade
Soldanella alpina
Alpine Snowbell
Solidago canadensis
Canadian Goldenrod
Solidago virgaurea
Goldenrod