Radiola, Genus
Ranunculaceae, Family
Ranunculales, Order
Ranunculus, Genus
Raphanus, Genus
Rapistrum, Genus
Reseda, Genus
Resedaceae, Family
Rhamnaceae, Family
Rhamnus, Genus
Rheum, Genus
Rhinanthus, Genus
Rhododendron, Genus
Rhus, Genus
Rhynchospora, Genus
Ribes, Genus
Ricinus, Genus
Robinia, Genus
Rorippa, Genus
Rosa, Genus
Rosaceae, Family
Rosales, Order
Rosmarinus, Genus
Rostraria, Genus
Rubia, Genus
Rubiaceae, Family
Rubus, Genus
Rudbeckia, Genus
Rumex, Genus
Ruppia, Genus
Ruppiaceae, Family
Ruta, Genus
Rutaceae, Family