Rumex crispus
Curled Dock
Rumex hydrolapathum
Water Dock
Rumex obtusifolius
Broad-leaved Dock
Rumex palustris
Marsh Dock
Rumex pulcher
Fiddle Dock
Rumex rupestris
Shore Dock
Rumex sanguineus
Wood Dock
Ruppia maritima
Beaked Tasselweed
Ruscus aculeatus
Butcher's-broom
Sabulina verna
Spring Sandwort
Sagina nodosa
Knotted Pearlwort
Sagina procumbens
Procumbent Pearlwort
Sagittaria sagittifolia
Arrowhead
Salix alba
White Willow
Salix aurita
Eared Willow
Salix caprea
Goat Willow
Salix cinerea
Grey Willow
Salix herbacea
Dwarf Willow
Salix pentandra
Bay Willow
Salix purpurea
Purple Willow
Salix repens
Creeping Willow
Salix viminalis
Osier
Salix x fragilis
Crack-willow
Salix x meyeriana
Shiny-leaved Willow
Salvia pratensis
Meadow Clary
Salvia verbenaca
Wild Clary
Sambucus ebulus
Dwarf Elder
Sambucus nigra
Elder
Samolus valerandi
Brookweed
Sanguisorba officinalis
Great Burnet
Sanicula europaea
Sanicle
Saponaria officinalis
Soapwort
Saxifraga aizoides
Yellow Saxifrage
Saxifraga cernua
Drooping Saxifrage
Saxifraga cespitosa
Tufted Saxifrage
Saxifraga granulata
Meadow Saxifrage
Saxifraga hirsuta
Kidney Saxifrage
Saxifraga hypnoides
Mossy Saxifrage
Saxifraga oppositifolia
Purple Saxifrage
Saxifraga rosacea
Irish Saxifrage
Saxifraga spathularis
St Patrick's-cabbage
Scabiosa columbaria
Small Scabious
Schedonorus giganteus
Giant Fescue
Scheuchzeria palustris
Rannoch-rush
Schoenoplectus lacustris
Common Club-rush
Schoenus nigricans
Black Bog-rush
Scilla autumnalis
Autumn Squill
Scilla verna
Spring Squill
Scirpoides holoschoenus
Round-headed Club-rush
Scirpus sylvaticus
Wood Club-rush
Scleranthus perennis
Perennial Knawel
Scorzoneroides autumnalis
Autumn Hawkbit
Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Scrophularia umbrosa
Green Figwort
Scutellaria galericulata
Skullcap
Scutellaria minor
Lesser Skullcap
Sedum acre
Biting Stonecrop
Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Selaginella selaginoides
Lesser Clubmoss
Senecio sarracenicus
Broad-leaved Ragwort
Serratula tinctoria
Saw-wort
Sibthorpia europaea
Cornish Moneywort
Silaum silaus
Pepper-saxifrage
Silene acaulis
Moss Campion
Silene dioica
Red Campion
Silene flos-cuculi
Ragged-Robin
Silene latifolia
White Campion
Silene nutans
Nottingham Catchfly