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)
Ribes nigrum
Black Currant
Ribes rubrum
Red Currant
Ribes sanguineum
Flowering Currant
Ribes uva-crispa
Gooseberry
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