Spergularia rupicola
Rock Sea-spurrey
Spiraea x rosalba
Intermediate Bridewort
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Spirodela polyrhiza
Greater Duckweed
Stachys arvensis
Field Woundwort
Stachys germanica
Downy Woundwort
Stachys sylvatica
Hedge Woundwort
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed
Stellaria holostea
Greater Stitchwort
Stellaria palustris
Marsh Stitchwort
Streptocarpus saxorum
False African Violet
Stuckenia pectinata
Fennel Pondweed
Succisa pratensis
Devil's-bit Scabious
Symphyotrichum lanceolatum
Narrow-leaved Michaelmas-daisy
Symphytum officinale
Common Comfrey
Symphytum orientale
White Comfrey
Symphytum x hidcotense
Hidcote Comfrey
Symphytum x uplandicum
Russian Comfrey
Syntrichia ruralis
Sand-hill Screw-moss
Tamus communis
Black Bryony
Tanacetum vulgare
Tansy
Taraxacum agg.
Dandelion