Salix pentandra
Bay Willow
Salix repens
Creeping Willow
Salix x fragilis
Crack-willow
Salix x meyeriana
Shiny-leaved Willow
Salsola kali
Prickly Saltwort
Salvia microphylla
Blackcurrant Sage
Salvia pratensis
Meadow Clary
Salvia splendens
Bonfire Salvia
Salvia verbenaca
Wild Clary
Samanea saman
Saman
Sambucus ebulus
Dwarf Elder
Sandoricum koetjape
Santol
Sanguisorba officinalis
Great Burnet
Sanicula europaea
Sanicle
Saxifraga aizoides
Yellow 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
Saxifraga tridactylites
Rue-leaved Saxifrage
Saxifraga x polita
False Londonpride
Scabiosa columbaria
Small Scabious
Schismatoglottis calyptrata
Dukaruk
Scilla autumnalis
Autumn Squill
Scilla siberica
Siberian Squill
Scindapsus pictus
Satin Pothos
Scirpus sylvaticus
Wood Club-rush
Scleranthus annuus
Annual Knawel
Scleranthus perennis
Perennial Knawel
Scrophularia auriculata
Water Figwort
Scrophularia nodosa
Common Figwort
Scrophularia umbrosa
Green Figwort
Scutellaria galericulata
Skullcap
Scutellaria incarnata
Hoary Skullcap
Scutellaria minor
Lesser Skullcap
Scyphiphora hydrophylacea
Nilad
Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Sedum sexangulare
Tasteless Stonecrop
Seemannia sylvatica
Bolivian Sunset
Selaginella martensii
Variegated Spikemoss
Selaginella willdenowii
Willdenow's Spikemoss
Senecio cambrensis
Welsh Groundsel
Senecio inaequidens
Narrow-leaved Ragwort
Senecio sarracenicus
Broad-leaved Ragwort
Senecio sylvaticus
Heath Groundsel
Senecio viscosus
Sticky Groundsel
Senecio vulgaris
Groundsel
Senna fistula
Golden Shower Tree
Senna surattensis
Scrambled Egg Tree
Sequoia sempervirens
Coastal Redwood
Sequoiadendron giganteum
Wellingtonia
Serratula tinctoria
Saw-wort
Setaria palmifolia
Palm Grass
Setaria verticillata
Hooked Bristlegrass
Sibthorpia europaea
Cornish Moneywort
Sida acuta
Common Wireweed
Sida cordata
Long-stalk Sida
Sida rhombifolia
Arrowleaf Sida
Silaum silaus
Pepper-saxifrage
Silene acaulis
Moss Campion
Silene armeria
Sweet-William Catchfly
Silene dioica
Red Campion
Silene flos-cuculi
Ragged-Robin
Silene latifolia
White Campion
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly