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- ``Pachycereus``
- ``Pachycormus``
- ``Pachycymbium``
- ``Pachyphragma``
- ``Pachyphytum``
- ``Pachypodium``
- ``Pachysandra``
- ``Pachystachys``
- ``Pachystegia``
- ``Pachystima``
- ``Pachyveria`` (hybrid genus)
- ``Paeonia`` - Şakayık - (peony)
- ``Paliurus`` - Karaçalı
- ``Pamianthe``
- ``Panax`` (ginseng)
- ``Pancratium`` - Kum Zambağı - (sea lily)
- ``Pandanus`` (screw pine)
- ``Pandorea``
- ``Panicum``
- ``Papaver`` - Gelincik - (poppy)
- ``Paphiopedilum`` (slipper orchid)
- ``Paradisea`` (paradise lily)
- ``Parahebe``
- ``Paraquilegia``
- ``Parkinsonia``
- ``Parnassia``
- ``Parochetus``
- ``Parodia``
- ``Paronychia``
- ``Parrotia``
- ``Parrotiopsis``
- ``Parthenocissus``
- ``Passiflora`` - Çarkıfelek - (granadilla, passionflower)
- ``Patersonia``
- ``Patrinia``
- ``Paulownia``
- ``Paurotis``
- ``Pavonia``
- ``Paxistima``
- ``Pedilanthus``
- ``Pediocactus``
- ``Peganum`` - Üzerlik
- ``Pelargonium`` - Sardunya
- ``Pellaea``
- ``Peltandra`` (arrow arum)
- ``Peltoboykinia``
- ``Peltophorum``
- ``Peniocereus``
- ``Pennisetum``
- ``Penstemon``
- ``Pentachrondra``
- ``Pentaglottis``
- ``Pentas``
- ``Peperomia``
- ``Peraphyllum``
- ``Pereskia``
- ``Perezia``
- ``Pericallis``
- ``Perilla``
- ``Periploca``
- ``Perovskia``
- ``Pernettya`` (now included in ``Gaultheria``)
- ``Persea``
- ``Persicaria`` (fleeceflower, knotweed)
- ``Petasites`` (butterbur, sweet coltsfoot)
- ``Petrea``
- ``Petrocosmea``
- ``Petrophile``
- ``Petrophyton``
- ``Petrophytum``
- ``Petrorhagia``
- ``Petroselinum`` (parsley)
- ``Petteria``
- ``Petunia``
- ``Phacelia``
- ``Phaedranassa`` (queen lily)
- ``Phaius`` (an orchid genus)
- ``Phalaenopsis`` (moth orchid)
- ``Phalaris``
- ``Phebalium``
- ``Phegopteris`` (beech fern)
- ``Phellodendron`` (cork tree)
- ``Philadelphus`` (mock orange)
- ``Philageria`` (hybrid genus)
- ``Philesia``
- ``Phillyrea`` - Akçakesme
- ``Philodendron``
- ``Phlebodium``
- ``Phlomis``
- ``Phlox``
- ``Phoenix`` (date palm)
- ``Phormium``
- ``Photinia``
- ``Phragmipedium`` (an orchid genus)
- ``Phragmites`` (reed)
- ``Phuopsis``
- ``Phygelius``
- ``Phylica`` (Cape myrtle)
- ``Phylliopsis`` (hybrid genus)
- ``Phyllocladus`` (toatoa)
- ``Phyllodoce``
- ``Phyllostachys``
- ``Phyllothamnus`` (hybrid genus)
- ``Physalis`` (ground cherry)
- ``Physaria`` (bladderpod)
- ``Physocarpus``
- ``Physoplexis``
- ``Physostegia``
- ``Phyteuma``
- ``Phytolacca`` (pokeweed)
- ``Picea`` (spruce)
- ``Picrasma``
- ``Pieris``
- ``Pilea``
- ``Pileostegia``
- ``Pileosella``
- ``Pilosocereus``
- ``Pimelea``
- ``Pimpinella`` -
- ``Pinanga``
- ``Pinckneya``
- ``Pinellia``
- ``Pinguicula`` (butterwort)
- ``Pinus`` - Çam - (pine)
- ``Piper`` (pepper)
- ``Piptanthus``
- ``Pisonia``
- ``Pistacia`` - Fıstık - (pistachio)
- ``Pistia``
- ``Pitcairnia``
- ``Pithecellobium``
- ``Pittosporum``
- ``Pityrogramma``
- ``Plantago`` - Sinir otu - (plantain)
- ``Platanus`` - Çınar - (plane tree, sycamore)
- ``Platycarya``
- ``Platycerium`` (staghorn fern)
- ``Platycladus`` (Chinese arborvitae)
- ``Platycodon`` (balloon flower)
- ``Platystemon`` (creamcups)
- ``Plectranthus``
- ``Pleioblastus``
- ``Pleione`` (an orchid genus)
- ``Pleiospilos`` (living granite)
- ``Pleurothallis`` (an orchid genus)
- ``Plumeria`` (frangipani)
- ``Poa``
- ``Podalyria``
- ``Podocarpus``
- ``Podophyllum`` (mayapple)
- ``Podranea``
- ``Polemonium`` (jacob`s ladder, abscess root)
- ``Polianthes``
- ``Poliothyrsis``
- ``Polygala`` (milkwort, seneca, snakeroot)
- ``Polygonatum``
- ``Polygonum`` - Madımak -(knotweed, knotgrass)
- ``Polypodium``
- ``Polyscias``
- ``Polystichum``
- ``Poncirus``
- ``Pongamia``
- ``Pontederia`` (pickerel weed)
- ``Populus`` (aspen, poplar, cottonwood)
- ``Porana``
- ``Portea``
- ``Portulaca`` - Semiz otu - (purslane, moss rose)
- ``Portulacaria``
- ``Posoqueria``
- ``Potamogeton``
- ``Potentilla`` (cinquefoil)
- ``Pothos``
- ``Potinara`` (hybrid orchid genus)
- ``Pratia``
- ``Primula`` (primrose)
- ``Prinsepia``
- ``Pritchardia``
- ``Proboscidea`` (unicorn plant)
- ``Promenaea``
- ``Prosopis`` (mesquite)
- ``Prostanthera`` (mint bush)
- ``Protea``
- ``Prumnopitys``
- ``Prunella`` (self-heal)
- ``Prunus`` (almond, apricot, cherry, peach, plum)
- ``Pseuderanthemum``
- ``Pseudocydonia``
- ``Pseudolarix`` (golden-larch)
- ``Pseudopanax``
- ``Pseudosasa``
- ``Pseudotsuga`` (douglas-fir)
- ``Pseudowintera``
- ``Psiolotum``
- ``Psychopsis`` (butterfly orchid)
- ``Psylliostachys`` (statice)
- ``Ptelea``
- ``Pteris`` (brake, table fern)
- ``Pterocactus``
- ``Pterocarya`` (wingnut)
- ``Pteroceltis``
- ``Pterocephalus``
- ``Pterodiscus``
- ``Pteropogon``
- ``Pterostyrax``
- ``Ptilotus``
- ``Ptychosperma``
- ``Pueraria``
- ``Pulmonaria`` (lungwort)
- ``Pulsatilla``
- ``Pultenaea``
- ``Punica`` - Nar - (pomegranate)
- ``Purshia``
- ``Puschkinia``
- ``Putoria``
- ``Puya``
- ``Pycnanthemum``
- ``Pycnostachys``
- ``Pyracantha`` (firethorn)
- ``Pyrola`` (wintergreen)
- ``Pyrostegia``
- ``Pyrrosia``
- ``Pyrus`` - Ahlat - (pear)
