Ranunculus peltatus
Pond Water-crowfoot
Ranunculus sardous
Hairy Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Ranunculus trichophyllus
Thread-leaved Water-crowfoot
Raphanus raphanistrum
Sea Radish
Reseda lutea
Wild Mignonette
Reseda luteola
Weld
Reynoutria japonica
Japanese Knotweed
Rhamnus cathartica
Buckthorn
Rhinanthus minor
Yellow-rattle
Rhodiola rosea
Roseroot
Rhynchospora alba
White Beak-sedge
Ribes sanguineum
Flowering Currant
Riccia beyrichiana
Purple Crystalwort
Riccia nigrella
Black Crystalwort
Romulea columnae
Sand Crocus
Rorippa palustris
Marsh Yellow-cress
Rosa arvensis
Field-rose
Rosa canina
Dog-rose
Rosa canina agg
Dog-rose
Rosa multiflora
Many-flowered Rose
Rosa sherardii
Sherard's Downy-rose
Rubia peregrina
Wild Madder
Rubus caesius
Dewberry