Saxifraga rotundifolia
Round-leaved Saxifrage
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
Seemannia sylvatica
Bolivian Sunset
Selaginella martensii
Variegated Spikemoss
Selaginella willdenowii
Willdenow's Spikemoss
Senecio sarracenicus
Broad-leaved Ragwort
Senecio vernalis
Eastern Groundsel
Senna obtusifolia
Sicklepod
Sequoiadendron giganteum
Wellingtonia
Seseli libanotis
Moon Carrot
Setaria viridis
Green Bristle-grass
Sicyos edulis
Chayote
Sida acuta
Common Wireweed
Sida rhombifolia
Arrowleaf Sida
Silene conica
Sand Catchfly
Silene gallica
Small-flowered Catchfly
Silene latifolia
White Campion
Silene noctiflora
Night-flowering Catchfly