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• Picea (spruce) • Picrasma • Pieris • Pilea • Pileostegia • Pileosella • Pilosocereus • Pimelea • Pimpinella • Pinanga • Pinckneya • Pinellia • Pinguicula (butterwort) • Pinus (pine) • Piper (pepper) • Piptanthus • Pisonia • Pistacia (pistachio) • Pistia • Pitcairnia • Pithecellobium • Pittosporum • Pityrogramma • Plantago (plantain) • Platanus (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 (knotweed, knotgrass) • Polypodium • Polyscias • Polystichum • Poncirus • Pongamia • Pontederia (pickerel weed) • Populus (aspen, poplar, cottonwood) • Porana • Portea • Portulaca (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 (pomegranate) • Purshia • Puschkinia • Putoria • Puya • Pycnanthemum • Pycnostachys • Pyracantha (firethorn) • Pyrola (wintergreen) • Pyrostegia • Pyrrosia • Pyrus (pear)

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• Pachistima • Pachycereus • Pachycormus • Pachycymbium • Pachyphragma • Pachyphytum • Pachypodium • Pachysandra • Pachystachys • Pachystegia • Pachystima • Pachyveria (hybrid genus) • Paeonia (peony) • Paliurus • Pamianthe • Panax (ginseng) • Pancratium (sea lily) • Pandanus (screw pine) • Pandorea • Panicum • Pansy • Papaver (poppy) • Paphiopedilum (slipper orchid) • Paradisea (paradise lily) • Parahebe • Paraquilegia • Parkinsonia • Parnassia • Parochetus • Parodia • Paronychia • Parrotia • Parrotiopsis • Parthenocissus • Passiflora (granadilla, passionflower) • Patersonia • Patrinia • Paulownia • Paurotis • Pavonia • Pedilanthus • Pediocactus • Pelargonium (geranium) • 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 • 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)