Quercus cerris
Turkey Oak
Quercus petraea
Sessile Oak
Quercus rubra
Red Oak
Quercus suber
Cork Oak
Radermachera yunnanensis
Ramonda myconi
Pyrenean-violet
Ranunculus acris
Meadow Buttercup
Ranunculus aquatilis
Common Water-crowfoot
Ranunculus auricomus
Goldilocks Buttercup
Ranunculus baudotii
Brackish Water-crowfoot
Ranunculus bulbosus
Bulbous Buttercup
Ranunculus flammula
Lesser Spearwort
Ranunculus fluitans
River Water-crowfoot
Ranunculus hederaceus
Ivy-leaved Crowfoot
Ranunculus lingua
Greater Spearwort
Ranunculus omiophyllus
Round-leaved Crowfoot
Ranunculus parviflorus
Small-flowered Buttercup
Ranunculus peltatus
Pond Water-crowfoot
Ranunculus repens
Creeping Buttercup
Ranunculus sardous
Hairy Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Ranunculus trichophyllus
Thread-leaved Water-crowfoot
Raphanus raphanistrum
Radish
Ravenala madagascariensis
East-West Palm
Reseda lutea
Wild Mignonette
Reseda luteola
Weld
Reynoutria japonica
Japanese Knotweed
Rhamnus cathartica
Buckthorn
Rhinanthus angustifolius
Greater Yellow-rattle
Rhinanthus minor
Yellow-rattle
Rhipsalis salicornioides
Spice Cactus
Rhizophora mangle
Red Mangrove
Rhodiola rosea
Roseroot
Rhododendron ferrugineum
Alpenrose
Rhododendron lindleyi
Rhododendron racemosum
Rhynchospora alba
White Beak-sedge
Ribes rubrum
Red Currant
Ribes sanguineum
Flowering Currant
Riccia flutians
Floating Crystalwort
Riccia nigrella
Black Crystalwort
Riccia subbifurca
Least Crystalwort
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
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 caesius
Dewberry
Rubus fruticosus agg.
Blackberry
Rubus idaeus
Raspberry
Rubus nessensis
Rubus saxatilis
Stone Bramble
Rubus scissus
Rubus sp
Rubus spectabilis
Salmonberry
Rubus ulmifolius
Rubus vestitus
Ruella simplex
Mexican Petunia
Ruellia simplex
Mexican Petunia
Ruellia tuberosa
Minnieroot
Rumex acetosa
Common Sorrel
Rumex acetosella
Sheep's Sorrel
Rumex crispus
Curled Dock