Parkinsonia 
Parnassia 
Paronychia 
Parosela 
Parrasia 
Parrya 
Parryella 
Parsonsia 
Parthenice 
Parthenium 
Parthenocissus 
Paspalum: 
Passiflora 
Pastinaca 
Pattalias 
Paulownia 
Pavonia 
Pectis 
Pectocarya 
Pedicularis 
Pedicularis 
Peganum 
Pelargonium 
Pellaea 
Peltandra 
Peltiphyllum 
Pennisetum 
Pentacaena 
Pentachaeta 
Penthorum 
Pentodon 
Pentstemon 
Pentstemon 
Peperomia 
Peramium 
Peraphyllum 
Perezia 
Pericome 
Perilla 
Periploca 
Perityle 
Persea 
Petalonyx 
Petalostemon 
Petasites 
Peteria 
Petiveria 
Petradoria 
Petrophyton 
Petroselinum 
Petunia 
Peucedanum 
Peucephyllum 
Phaca 
Phacelia 
Phalacroseris 
Phalaris 
Phanerophlebia 
Pharus 
Phaseolus 
Phegopteris 
Phellopterus 
Pherotrichus 
Philadelphus 
Philibertella 
Philibertia 
249 
Philotria 
Philoxerus 
Phippsia 
Phlebodium 
Phleum 
Phlomis 
Phlox 
Phoenicaulis 
Pholisma 
Phoradendron 
Phragmites 
Phryma 
Phyla 
Phyllanthus 
Phyllitis 
Phyllodice 
Phyllospadix 
Phymatodes 
Physalis - 
Physalis 
Physalodes 
Physaria 
Physocarpus 
Physostegia 
Physurus 
Phytolacca 
Piaropus 
Picea 
Pickeringia 
Picradenia 
Picramnia 
Picris 
Pieris 
Pilea 
Pilularia 
Pimpinella 
Pinaropappus 
Pinckneya 
Pinguicula 
Pinus 
Piptocalyx 
Piriqueta 
Piscidia 
Pisonia 
Pistia 
Pithecolobium 
Plagiobothrys 
Planera 
Plantago 
Platanus 
Platyspermum 
Platystemon 
Platystigma 
Plectritis 
Pleea 
Pleuricospora 
Pleurogyne 
Pleuropogon 
Pluchea 
Plumbago 
Plummera 
Pneumaria 
Poa 
Podistera 
Podophyllum 
Podostemma 
Podostemon 
Podostigma 
Pogogyne 
Pogonia 
Polanisia 
Polemonium 
Poliomintha 
Polycarpon 
Polycodium 
Polygala 
Polygonatum 
Polygonella 
Polygonum 
Polymeia 
Polypodium 
Polypogon 
Polypremum 
Polypteris 
Polystachya 
Polystichum 
Polytaenia 
Pontederia 
Ponthieva 
Populus 
Porliera 
Porophyllum 
Porteranthus 
Porterella 
Portulaca 
Potamogeton 
Potentilla 
Potentilla 
Poterium 
Prenanthes 
Primula 
Prionopsis 
Priva 
Proserpinaca 
Prosopis 
Prunella 
Prunus 
Psaracha 
Psathyrotes 
102, 
Pseudocymopterus 
Pseudophoenix 
Pseudotsuga 
Psidium 
Psilactis 
Psilocarphus 
Psilocarya 
Psilostrophe 
Psilotum 
Psoralea 
Psychotria 
Ptelea 
Pteridium 
Pteris 
Pterocaulon 
Pterospora 
Pterostegia 
Ptilimnium 
Ptilocalais 
Ptilonella 
Ptiloria 
Puccinellia 
Pulsatilla 
