Solidago virgaurea
Goldenrod
Sonchus asper
Prickly Sow-thistle
Sorbus aria
Common Whitebeam
Sorbus cambrensis
Welsh Whitebeam
Sorbus leptophylla
Thin-leaved Whitebeam
Sorbus leyana
Ley's Whitebeam
Sorbus minima
Least Whitebeam
Sorbus porrigentiformis
Grey-leaved Whitebeam
Sorbus stenophylla
Llanthony Whitebeam
Sparganium angustifolium
Floating Bur-reed
Spathiphyllum blandum
Pleasant Peace Lily
Spathodea campanulata
African Tulip Tree
Spathoglottis plicata
Philippine Ground Orchid
Spergula arvensis
Corn Spurrey
Spergularia rubra
Sand Spurrey
Spermacoce exilis
False Buttonweed
Spermacoce hispida
Shaggy Buttonweed
Spermacoce remota
Sphagneticola trilobata
Bay Biscayne Creeping-oxeye
Sphagnum denticulatum
Cow-horn Bog-moss
Spigelia anthelmia
West Indian Pinkroot
Stachytarpheta jamaicensis
Blue Porterweed
Stellaria aquatica
Water Chickweed
Stellaria graminea
Lesser Stitchwort