Ptelea
Pteris
Pterocactus
Pterocarya
Pteroceltis
Pterocephalus
Pterodiscus
Pteropogon
Pterostyrax
Ptilotus
Ptychosperma
Pueraria
Pulmonaria
Pulsatilla
Pultenaea
Punica
Purshia
Puschkinia
Putoria
Puya
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Pycnanthemum
Pycnostachys
Pyracantha
Pyrola
Pyrostegia
Pyrrosia
Pyrus
Quamoclit
Quaqua
Quercus (oak)
Quesnelia
Quisqualis
Ramonda
Ranzania
Raoulia
Raphia (raffia)
Ratibida
Ravenala
Rebutia
Rehderodendron
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Rehmannia
Reineckia
Reinwardtia
Reseda
Retama
Rhamnus
Rhaphidophora
Rhaphiolepis
Rhapidophyllum
Rhapis
Rheum
Rhexia
Rhipsalis
Rhodanthe
Rhodanthemum
Rhodiola
Rhodochiton
Rhododendron
Rhodohypoxis
Rhodophiala
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Rhodothamnus
Rhodotypos
Rhoeo
Rhoicissus
Rhombophyllum
Rhus
Rhynchelytrum
Rhynchostylis
Ribes
Richea
Ricinus
Rigidella
Robinia
Rochea
Rodgersia
Rodriguezia
Rohdea
Romanzoffia
Romneya
Romulea
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Rondeletia
Rosa
Roscoea
Rosmarinus
Rossioglossum
Rothmannia
Roystonea
Rubus
Rudbeckia
Ruellia
Rumex
Rumohra
Rupicapnos
Ruschia
Ruscus
Russelia
Ruta
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