Sonchus oleraceus
Smooth Sow-thistle
Sorbus aria
Common Whitebeam
Sorbus aucuparia
Rowan
Sorbus leyana
Ley's Whitebeam
Sorbus porrigentiformis
Grey-leaved Whitebeam
Sorbus rupicola
Rock Whitebeam
Sorbus torminalis
Wild Service-tree
Sparganium angustifolium
Floating Bur-reed
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
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Stachys germanica
Downy Woundwort
Stachys palustris
Marsh Woundwort
Stachys sylvatica
Hedge Woundwort
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
Suaeda maritima
Annual Sea-blite
Succisa pratensis
Devil's-bit Scabious
Symphytum officinale
Common Comfrey
Symphytum orientale
White Comfrey
Tamus communis
Black Bryony
Tanacetum vulgare
Tansy
Taraxacum agg.
Dandelion
Taraxacum 'iscanum'
Taraxacum luteum
Taraxacum palustre
Taraxacum richardsianum
Taraxacum Section Erythrosperma
Dandelion
Taraxacum Section Hamata
Dandelion
Taraxacum Section Ruderalia
Dandelion
Taraxacum subnaevosum
Taxus baccata
Yew
Teesdalia nudicaulis
Shepherd's Cress
Tephroseris integrifolia
South Stack Fleawort
Teucrium scorodonia
Wood Sage
Thalictrum flavum
Common Meadow-rue
Thalictrum minus
Lesser Meadow-rue
Thelypteris palustris
Marsh Fern
Thesium humifusum
Bastard-toadflax
Thymus drucei
Wild Thyme
Tilia cordata
Small-leaved Lime
Tilia platyphyllos
Large-leaved Lime
Tofieldia pusilla
Scottish Asphodel
Torilis japonica
Upright Hedge-parsley
Torilis nodosa
Knotted Hedge-parsley
Tragopogon pratensis
Goat's-beard
Trichomanes speciosum
Killarney Fern
Trichophorum germanicum
Deergrass
Trifolium arvense
Hare's-foot Clover
Trifolium campestre
Hop Trefoil
Trifolium dubium
Lesser Trefoil
Trifolium fragiferum
Strawberry Clover
Trifolium medium
Zigzag Clover
Trifolium micranthum
Slender Trefoil
Trifolium ochroleucon
Sulphur Clover
Trifolium pratense
Red Clover
Trifolium repens
White Clover
Trifolium scabrum
Rough Clover
Triglochin maritima
Sea Arrowgrass