Spergula arvensis
Corn Spurrey
Spergularia marina
Lesser Sea-spurrey
Spergularia media
Greater Sea-spurrey
Spergularia rubra
Sand Spurrey
Spergularia rupicola
Rock Sea-spurrey
Spermacoce exilis
False Buttonweed
Spermacoce hispida
Shaggy Buttonweed
Spermacoce remota
Sphagneticola trilobata
Bay Biscayne Creeping-oxeye
Spigelia anthelmia
West Indian Pinkroot
Spiraea x rosalba
Intermediate Bridewort
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Stachys alpina
Limestone Woundwort
Stachys arvensis
Field Woundwort
Stachys byzantina
Lamb's-ear
Stachys germanica
Downy Woundwort
Stachys palustris
Marsh Woundwort
Stachys sylvatica
Hedge Woundwort
Stachytarpheta cayennensis
Blue Snakeweed
Stapelia variegata
Staphylea pinnata
Bladdernut
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed
Stellaria graminea
Lesser Stitchwort
Stellaria holostea
Greater Stitchwort
Stellaria media
Common Chickweed
Stellaria neglecta
Greater Chickweed
Stellaria palustris
Marsh Stitchwort
Sternbergia lutea
Winter Daffodil
Streptocarpus saxorum
False African Violet
Stylosanthes guianensis
Stylo
Suaeda maritima
Annual Sea-blite
Succisa pratensis
Devil's-bit Scabious
Symphoricarpos albus
Snowberry
Symphyotrichum lanceolatum
Narrow-leaved Michaelmas-daisy
Symphytum asperum
Rough Comfrey
Symphytum officinale
Common Comfrey
Symphytum orientale
White Comfrey
Symphytum tuberosum
Tuberous Comfrey
Symphytum x hidcotense
Hidcote Comfrey
Symphytum x uplandicum
Russian Comfrey
Synedrella nodiflora
Nodeweed
Tabernaemontana alternifolia
East Indian Rosebay
Tabernaemontana divaricata
Carnation of India
Tagetes lucida
Mexican Tarragon
Talinum paniculatum
Fameflower
Tamarix gallica
Tamarisk
Tamus communis
Black Bryony
Tanacetum parthenium
Feverfew
Tanacetum vulgare
Tansy
Taraxacum agg.
Taraxacum britannicum
Taraxacum falcatum
Dandelion
Taraxacum 'iscanum'
Taraxacum luteum
Taraxacum palustre
Taraxacum porteri
Taraxacum Section Erythrosperma
Dandelion
Taraxacum Section Hamata
Dandelion
Taraxacum Section Ruderalia
Dandelion
Taraxacum subnaevosum
Taxus baccata
Yew
Teesdalia nudicaulis
Shepherd's Cress
Tellima grandiflora
Fringecups
Tephroseris integrifolia
South Stack Fleawort
Tephrosia noctiflora
Teucrium chamaedrys
Wall Germander
Teucrium scorodonia
Wood Sage
Thalictrum aquilegiifolium
French Meadow-rue