Salix x meyeriana
Shiny-leaved Willow
Salsola kali
Prickly Saltwort
Salvia verbenaca
Wild Clary
Sambucus ebulus
Dwarf Elder
Sanguisorba officinalis
Great Burnet
Sanicula europaea
Sanicle
Saxifraga aizoides
Yellow 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 x polita
False Londonpride
Scabiosa columbaria
Small Scabious
Schoenoplectus tabernaemontani
Grey Club-rush
Scilla verna
Spring Squill
Scirpus sylvaticus
Wood Club-rush
Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Scrophularia umbrosa
Green Figwort
Scutellaria galericulata
Skullcap
Scutellaria minor
Lesser Skullcap
Senecio cambrensis
Welsh Groundsel
Senecio inaequidens
Narrow-leaved Ragwort