R
Ranunculus
Raoulia
Ratibida
Rehmannia
Reineckia
Rhamnus
Rheum
Rhodocoma
Rhododendron
Rhodohypoxis
Rhodophiala
Ribes
Rodgersia
Rohdea
Romneya
Rosa
Roscoea
Rosmarinus
Rubus
Rudbeckia
Ruellia
Ruscus
Ruta