Ricinus communis
Castor-oil-plant
Rorippa palustris
Marsh Yellow-cress
Rorippa sylvestris
Creeping Yellow-cress
Rosa arvensis
Field-rose
Rosa caesia
Hairy Dog-rose
Rosa canina agg
Dog-rose
Rosa multiflora
Many-flowered Rose
Rosa sherardii
Sherard's Downy-rose
Rosa spinosissima
Burnet Rose
Rosmarinus officinalis
Rosemary
Rubia peregrina
Wild Madder
Rubus biloensis
Rubus caesius
Dewberry
Rubus fuscicortex
Rubus iscanus
Rubus nemoralis
Rubus nessensis
Rubus pedemontanus
Rubus saxatilis
Stone Bramble
Rubus scissus
Rubus spectabilis
Salmonberry
Rubus tricolor
Chinese Bramble
Rubus troiensis
Rubus ulmifolius
Rubus vestitus
Ruellia tuberosa
Minnieroot
Rumex acetosa
Common Sorrel
Rumex acetosella
Sheep's Sorrel
Rumex crispus
Curled Dock
Rumex hydrolapathum
Water Dock
Rumex maritimus
Golden Dock
Rumex obtusifolius
Broad-leaved Dock
Rumex rupestris
Shore Dock
Rumex scutatus
French Sorrel
Ruppia maritima
Beaked Tasselweed
Ruscus aculeatus
Butcher's-broom
Sabulina verna
Spring Sandwort
Sagina nodosa
Knotted Pearlwort
Sagittaria sagittifolia
Arrowhead
Salicornia fragilis
Yellow Glasswort
Salix aurita
Eared 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 microphylla
Blackcurrant Sage
Salvia pratensis
Meadow Clary
Salvia splendens
Bonfire Salvia
Salvia verbenaca
Wild Clary
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