Pratia
Primula
Prinsepia
Pritchardia
Proboscidea
Promenaea
Prosopis
Prostanthera
Prunella
Prunus
Pseuderanthemum
Pseudocydonia
Pseudolarix
Pseudopanax
Pseudosasa
Pseudotsuga
Pseudowintera
Psychopsis

Psylliostachys
Ptelea
Pteris
Pterocactus
Pterocarya
Pteroceltis
Pterocephalus
Pterodiscus
Pterostyrax
Ptilotus
Ptychosperma
Pueraria
Pulmonaria
Pulsatilla
Pultenaea
Punica
Purshia
Puschkinia

Putoria
Puya
Pycnanthemum
Pycnostachys
Pyracantha
Pyrola
Pyrostegia
Pyrrosia
Pyrus
Quamoclit
Quaqua
Quercus (oak)
Quesnelia
Quisqualis
Ramonda
Ranunculus (buttercup, crowfoot)
Ranzania
Raoulia

Raphia (raffia)
Ratibida
Ravenala
Rebutia
Rehderodendron
Rehmannia
Reineckia
Reinwardtia
Reseda
Retama
Rhamnus
Rhaphidophora
Rhaphiolepis
Rhapidophyllum
Rhapis
Rheum
Rhexia
Rhipsalis