Salix repens
Creeping Willow
Salpichroa origanifolia
Cock's-eggs
Salvia farinacea
Mealy Sage
Salvia hispanica
Golden Chia
Salvia involucrata
Rosy-leaf sage
Salvia leucanthe
Mexican Bush Sage
Salvia pratensis
Meadow Clary
Salvia splendens
Bonfire Salvia
Samanea saman
Saman
Sambucus canadensis
American Elderberry
Sambucus ebulus
Dwarf Elder
Sanchezia oblonga
Zebra Plant
Sandoricum koetjape
Santol
Saraca indica
Asoka Tree
Saturnia pavonia
Emperor Moth Caterpillar
Saxifraga granulata
Meadow Saxifrage
Saxifraga hypnoides
Mossy Saxifrage
Saxifraga oppositifolia
Purple Saxifrage
Saxifraga rotundifolia
Round-leaved Saxifrage
Saxifraga tridactylites
Rue-leaved Saxifrage
Scabiosa columbaria
Small Scabious
Schaueria calytricha
Golden Plume
Schedonorus giganteus
Giant Fescue
Scheuchzeria palustris
Rannoch-rush
Schismatoglottis calyptrata
Dukaruk
Scindapsus pictus
Satin Pothos
Scleroderma aerolatum
Leopard Earthball
Scrophularia umbrosa
Green Figwort
Scutellaria galericulata
Skullcap
Scutellaria incarnata
Hoary Skullcap
Scyphiphora hydrophylacea
Nilad
Sedum album
White Stonecrop
Seemannia sylvatica
Bolivian Sunset Gloxinia
Selaginella martensii
Variegated Spikemoss
Selaginella willdenowii
Willdenow's Spikemoss
Selenicereus undatus
Pitahaya
Senecio sarracenicus
Broad-leaved Ragwort
Senecio vernalis
Eastern Groundsel
Senega paniculata
Root Beer Plant
Senna alata
Emperor's Candlesticks
Senna fistula
Golden Shower Tree
Senna obtusifolia
Sicklepod
Senna surattensis
Scrambled Egg Tree
Sequoiadendron giganteum
Wellingtonia
Seseli libanotis
Moon Carrot
Sesuvium portulacastrum
Sea Purslane
Setaria palmifolia
Palm Grass
Setaria verticillata
Hooked Bristlegrass
Setaria viridis
Green Bristle-grass
Sicyos edulis
Chayote
Sida acuta
Common Wireweed
Sida cordata
Long-stalk Sida
Sida rhombifolia
Arrowleaf Sida
Silene conica
Sand Catchfly
Silene flos-cuculi
Ragged-Robin
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
Solandra grandiflora
Showy Chalicevine
Solanum aethiopicum
Ethiopian Eggplant
Solanum americanum
American Black Nightshade
Solanum chenopodioides
Tall Nightshade
Solanum erianthum
Velvet Nightshade
Solanum melongena
Eggplant
Solanum torvum
Pendejera
Soldanella alpina
Alpine Snowbell