Ranunculus flammula
Lesser Spearwort
Ranunculus fluitans
River Water-crowfoot
Ranunculus lingua
Greater Spearwort
Ranunculus parviflorus
Small-flowered Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Raphanus raphanistrum
Radish
Raphanus sativus
Garden Radish
Reseda lutea
Wild Mignonette
Reseda luteola
Weld
Reynoutria japonica
Japanese Knotweed
Rhinanthus minor
Yellow-rattle
Rhipsalis salicornioides
Spice Cactus
Rhodiola rosea
Roseroot
Ribes rubrum
Red Currant
Ribes uva-crispa
Gooseberry
Rorippa sylvestris
Creeping Yellow-cress
Rosa caesia
Hairy Dog-rose
Rosa multiflora
Many-flowered Rose
Rosa sp.
Rosa spinosissima
Burnet Rose
Rosa stylosa
Short-styled Field-rose
Rosmarinus officinalis
Rosemary
Rubia peregrina
Wild Madder
Rubus ariconiensis