Solidago virgaurea
Goldenrod
Sonchus arvensis
Perennial Sow-thistle
Sorbus aucuparia
Rowan
Sorbus minima
Least Whitebeam
Sorbus torminalis
Wild Service-tree
Sparganium erectum
Branched Bur-reed
Sparganium natans
Least Bur-reed
Spergula arvensis
Corn Spurrey
Spergularia marina
Lesser Sea-spurrey
Spergularia media
Greater Sea-spurrey
Spergularia rubra
Sand Spurrey
Spergularia rupicola
Rock Sea-spurrey
Sphagneticola trilobata
Bay Biscayne Creeping-oxeye
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Splachnum ampullaceum
Cruet Collar-moss
Stachys arvensis
Field Woundwort
Stachys germanica
Downy Woundwort
Stachys palustris
Marsh Woundwort
Stachytarpheta cayennensis
Blue Snakeweed
Stapelia variegata
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed
Stellaria graminea
Lesser Stitchwort
Stellaria holostea
Greater Stitchwort
Stellaria neglecta
Greater Chickweed
Sternbergia lutea
Winter Daffodil
Stropharia semiglobata
Dung Roundhead
Suaeda maritima
Annual Sea-blite
Succisa pratensis
Devil's-bit Scabious
Symphoricarpos albus
Snowberry
Symphyotrichum lanceolatum
Narrow-leaved Michaelmas-daisy
Symphytum officinale
Common Comfrey
Symphytum tuberosum
Tuberous Comfrey
Symphytum x hidcotense
Hidcote Comfrey
Symphytum x uplandicum
Russian Comfrey
Talinum paniculatum
Fameflower
Tamarix gallica
Tamarisk
Tamus communis
Black Bryony
Tanacetum parthenium
Feverfew
Tanacetum vulgare
Tansy
Taraxacum falcatum
Dandelion
Taraxacum 'iscanum'
Taraxacum luteum
Taraxacum porteri
Taxus baccata
Yew
Teesdalia nudicaulis
Shepherd's Cress
Tellima grandiflora
Fringecups
Tephroseris integrifolia
South Stack Fleawort
Tetraphis pellucida
Pellucid Four-tooth Moss
Teucrium scorodonia
Wood Sage
Thalictrum flavum
Common Meadow-rue
Thalictrum minus
Lesser Meadow-rue
Thymus drucei
Wild Thyme
Thysanolaena latifolia
Tiger Grass
Tilia x europaea
Lime
Tipula maxima
Giant Cranefly
Tofieldia pusilla
Scottish Asphodel
Torenia crustacea
Malaysian False Pimpernel
Torilis japonica
Upright Hedge-parsley
Torilis nodosa
Knotted Hedge-parsley
Tragopogon porrifolius
Salsify
Tragopogon pratensis
Goat's-beard
Trametes versicolor
Turkey Tails
Tremella mesenterica
Yellow Brain Fungus
Trichoglossum hirsutum
Hairy Earthtongue
Trichomanes speciosum
Killarney Fern
Tridax procumbens
Coatbuttons
Trifolium arvense
Hare's-foot Clover
Trifolium campestre
Hop Trefoil