Ranunculus parviflorus
Small-flowered Buttercup
Ranunculus peltatus
Pond Water-crowfoot
Ranunculus penicillatus
Stream Water-crowfoot
Ranunculus repens
Creeping Buttercup
Ranunculus sardous
Hairy Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Ranunculus trichophyllus
Thread-leaved Water-crowfoot
Raphanus raphanistrum
Radish
Raphanus sativus
Garden Radish
Ravenala madagascariensis
East-West Palm
Reseda lutea
Wild Mignonette
Reseda luteola
Weld
Reynoutria japonica
Japanese Knotweed
Rhamnus cathartica
Buckthorn
Rheum officinale
Tibetan Rhubarb
Rhinanthus alectorolophus
European Yellow-rattle
Rhinanthus angustifolius
Greater Yellow-rattle
Rhinanthus minor
Yellow-rattle
Rhipsalis salicornioides
Spice Cactus
Rhodiola rosea
Roseroot
Rhododendron cinnibarinum
Rhododendron ferrugineum
Alpenrose
Rhododendron lindleyi
Rhododendron loderi
Rhododendron ponticum
Rhododendron
Rhododendron racemosum
Rhododendron (racemosum)
Rhynchospora alba
White Beak-sedge
Rhynchospora fusca
Brown Beak-sedge
Ribes nigrum
Black Currant
Ribes rubrum
Red Currant
Ribes sanguineum
Flowering Currant
Ribes uva-crispa
Gooseberry
Riccia beyrichiana
Purple Crystalwort
Riccia fluitans
Floating crystalwort
Riccia nigrella
Black Crystalwort
Riccia subbifurca
Least Crystalwort
Ricinus communis
Castor-oil-plant
Rivini humilis
Bloodberry
Robinia pseudoacacia
False-acacia
Romulea columnae
Sand Crocus
Rorippa islandica
Northern Yellow-cress
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 rubiginosa
Sweet-briar
Rosa rugosa
Japanese Rose
Rosa sherardii
Sherard's Downy-rose
Rosa sp.
Rosa spinosissima
Burnet Rose
Rosa stylosa
Short-styled Field-rose
Rose, Albertine
Albertine Rose
Rosmarinus officinalis
Rosemary
Rubia peregrina
Wild Madder
Rubus aquarum
Rubus ariconiensis
Rubus biloensis
Rubus caesius
Dewberry
Rubus dasyphyllus
Rubus fraxinifolius
Mountain Raspberry
Rubus fruticosus agg.
Blackberry
Rubus fuscicortex
Rubus idaeus
Raspberry
Rubus incurvatus
Rubus iscanus
Rubus nemoralis
Rubus nessensis