Sorbus aucuparia
Rowan
Sorbus cambrensis
Welsh Whitebeam
Sorbus leyana
Ley's Whitebeam
Sorbus minima
Least Whitebeam
Sorbus torminalis
Wild Service-tree
Sparganium angustifolium
Floating Bur-reed
Sparganium erectum
Branched Bur-reed
Sparganium natans
Least Bur-reed
Spartina anglica
Common Cord-grass
Spathiphyllum blandum
Pleasant Peace Lily
Spathoglottis plicata
Philippine Ground Orchid
Spergularia rubra
Sand Spurrey
Spigelia anthelmia
West Indian Pinkroot
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
Staphylea pinnata
Bladdernut
Stellaria aquatica
Water Chickweed
Stellaria graminea
Lesser Stitchwort
Stellaria neglecta
Greater Chickweed
Stylosanthes guianensis
Stylo
Succisa pratensis
Devil's-bit Scabious
Symphyotrichum lanceolatum
Narrow-leaved Michaelmas-daisy
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
Tamus communis
Black Bryony
Tanacetum parthenium
Feverfew
Tanacetum vulgare
Tansy
Taraxacum agg.
Dandelion
Taraxacum 'iscanum'
Taraxacum luteum
Taraxacum palustre
Taraxacum porteri
Teesdalia nudicaulis
Shepherd's Cress
Tellima grandiflora
Fringecups
Tephroseris integrifolia
South Stack Fleawort
Tephrosia noctiflora
Teucrium scorodonia
Wood Sage
Thalictrum flavum
Common Meadow-rue
Thalictrum minus
Lesser Meadow-rue
Thesium humifusum
Bastard-toadflax
Thlaspi arvense
Field Penny-cress
Thymus drucei
Wild Thyme
Thysanolaena latifolia
Tiger Grass
Tilia x europaea
Lime
Torilis japonica
Upright Hedge-parsley
Tragopogon pratensis
Goat's-beard
Trichophorum germanicum
Deergrass
Trifolium arvense
Hare's-foot Clover
Trifolium campestre
Hop Trefoil
Trifolium fragiferum
Strawberry Clover
Trifolium hybridum
Alsike Clover
Trifolium medium
Zigzag Clover
Trifolium micranthum
Slender Trefoil
Trifolium ochroleucon
Sulphur Clover
Trifolium pratense
Red Clover
Trifolium scabrum
Rough Clover
Triglochin palustris
Marsh Arrowgrass
Trimezia coerulea
Walking Iris
Trocdaris verticillata
Whorled Caraway
Trollius europaeus
Globeflower