Rhododendron lindleyi
Rhynchospora alba
White Beak-sedge
Rivini humilis
Bloodberry
Rosa arvensis
Field-rose
Rosa multiflora
Many-flowered Rose
Rosa rugosa
Japanese Rose
Rubus ariconiensis
Rubus biloensis
Rubus caesius
Dewberry
Rubus fruticosus agg.
Rubus incurvatus
Rubus nemoralis
Rubus pedemontanus
Rubus saxatilis
Stone Bramble
Rubus troiensis
Rubus tuberculatus
Sabulina verna
Spring Sandwort
Sagina nodosa
Knotted Pearlwort
Sagina procumbens
Procumbent Pearlwort
Sagittaria sagittifolia
Arrowhead
Sambucus ebulus
Dwarf Elder
Samolus valerandi
Brookweed
Sanicula europaea
Sanicle
Saponaria officinalis
Soapwort
Satureja montana
Winter Savory
Saxifraga cespitosa
Tufted Saxifrage
Saxifraga granulata
Meadow Saxifrage
Saxifraga hypnoides
Mossy Saxifrage
Saxifraga rosacea
Irish Saxifrage
Saxifraga spathularis
St Patrick's-cabbage
Saxifraga tridactylites
Rue-leaved Saxifrage
Saxifraga umbrosa
Pyrenean Saxifrage
Schaueria calytricha
Golden Plume
Scutellaria minor
Lesser Skullcap
Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Senega paniculata
Root Beer Plant
Seseli libanotis
Moon Carrot
Sherardia arvensis
Field Madder
Silene flos-cuculi
Ragged-Robin
Silene gallica
Small-flowered Catchfly
Silene latifolia
White Campion
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Silene rupestris
Rock Campion
Silene uniflora
Sea Campion
Silene vulgaris
Bladder Campion
Simethis mattiazzii
Kerry Lily
Sison amomum
Stone Parsley
Solanum chenopodioides
Tall Nightshade
Solanum erianthum
Velvet Nightshade
Solanum nigrum
Black Nightshade
Solanum nitidibaccatum
Green Nightshade
Sorbus minima
Least Whitebeam
Spathiphyllum blandum
Pleasant Peace Lily
Spergula arvensis
Corn Spurrey
Spergularia media
Greater Sea-spurrey
Spermacoce hispida
Shaggy Buttonweed
Spermacoce remota
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Stachys palustris
Marsh Woundwort
Staphylea pinnata
Bladdernut
Stellaria alsine
Bog Stitchwort
Stellaria aquatica
Water Chickweed
Stellaria graminea
Lesser Stitchwort
Stellaria holostea
Greater Stitchwort
Stellaria neglecta
Greater Chickweed
Stellaria palustris
Marsh Stitchwort
Strobilanthes reptans
Waffle Plant