Rumex acetosella
Sheep's Sorrel
Salvia involucrata
Rosy-leaf sage
Sanicula europaea
Sanicle
Saponaria officinalis
Soapwort
Saxifraga
Garden Saxifrage
Saxifraga oppositifolia
Purple Saxifrage
Saxifraga umbrosa
Pyrenean Saxifrage
Scabiosa columbaria
Small Scabious
Scutellaria minor
Lesser Skullcap
Sedum anglicum
English Stonecrop
Sempervivum arachnoideum
Cobweb House-leek
Serratula tinctoria
Saw-wort
Sherardia arvensis
Field Madder
Sibthorpia europaea
Cornish Moneywort
Silene acaulis
Moss Campion
Silene armeria
Sweet-William Catchfly
Silene conica
Sand Catchfly
Silene dioica
Red Campion
Silene flos-cuculi
Ragged-Robin
Silene gallica
Small-flowered Catchfly
Silene noctiflora
Night-flowering Catchfly
Silene viscaria
Sticky Catchfly
Soldanella alpina
Alpine Snowbell
Spathoglottis plicata
Philippine Ground Orchid