Rubus vestitus
Ruella simplex
Mexican Petunia
Rumex acetosa
Common Sorrel
Rumex acetosella
Sheep's Sorrel
Rumex crispus
Curled Dock
Rumex cristatus
Greek Dock
Rumex maritimus
Golden Dock
Rumex palustris
Marsh Dock
Rumex sanguineus
Wood Dock
Sabulina verna
Spring Sandwort
Sagina apetala
Annual Pearlwort
Sagina procumbens
Procumbent Pearlwort
Sagittaria sagittifolia
Arrowhead
Salicornia dolichostachya
Long-spiked Glasswort
Salicornia emerici
Shiny Glasswort
Salicornia europaea
Common Glasswort
Salicornia fragilis
Yellow Glasswort
Salicornia ramosissima
Purple Glasswort
Salix cinerea
Grey Willow
Salix herbacea
Dwarf Willow
Salix pentandra
Bay Willow
Salix repens
Creeping Willow
Salix x fragilis
Crack-willow
Salix x meyeriana
Shiny-leaved Willow
Salsola kali
Prickly Saltwort
Salvia farinacea
Mealy Sage
Salvia involucrata
Rosy-leaf sage
Salvia leucanthe
Mexican Bush Sage
Salvia officinalis
Sage
Salvia pratensis
Meadow Clary
Salvia splendens
Bonfire Salvia
Sambucus ebulus
Dwarf Elder
Sambucus nigra
Elder
Samolus valerandi
Brookweed
Sanguisorba officinalis
Great Burnet
Sanicula europaea
Sanicle
Saponaria officinalis
Soapwort
Saxifraga cernua
Drooping Saxifrage
Saxifraga granulata
Meadow Saxifrage
Saxifraga hypnoides
Mossy Saxifrage
Saxifraga spathularis
St Patrick's-cabbage
Saxifraga tridactylites
Rue-leaved Saxifrage
Scabiosa columbaria
Small Scabious
Schedonorus giganteus
Giant Fescue
Schoenoplectus lacustris
Common Club-rush
Schoenoplectus tabernaemontani
Grey Club-rush
Schoenus nigricans
Black Bog-rush
Scilla verna
Spring Squill
Scirpus sylvaticus
Wood Club-rush
Scleranthus annuus
Annual Knawel
Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Scutellaria galericulata
Skullcap
Scutellaria incarnata
Hoary Skullcap
Scutellaria minor
Lesser Skullcap
Sedum acre
Biting Stonecrop
Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Seemannia sylvatica
Bolivian Sunset
Senecio inaequidens
Narrow-leaved Ragwort
Senecio sarracenicus
Broad-leaved Ragwort
Senecio squalidus
Oxford Ragwort
Senecio sylvaticus
Heath Groundsel
Senecio viscosus
Sticky Groundsel
Senecio vulgaris
Groundsel
Senega paniculata
Root Beer Plant
Senna fistula
Golden Shower Tree
Serratula tinctoria
Saw-wort
Seseli libanotis
Moon Carrot
Setaria verticillata
Hooked Bristlegrass