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Pacherocactus (1 taxon)
Pachgerocereus (1 obsolete name)
Pachidendron (1 obsolete name)
Pachycereus (13 taxa, 17 obsolete names)
Pachycormus (1 taxon)
Pachycymbium (1 obsolete name)
Pachyphytum (10 taxa, 2 obsolete names)
Pachypodium (9 taxa, 5 obsolete names)
Pachyrhizus (1 taxon, 2 obsolete names)
Pachysandra (2 taxa)
Pachystachys (2 taxa)
Pachystima (1 obsolete name)
Pachyveria (1 taxon)
Packera (1 taxon)
Padus (2 obsolete names)
Paeonia (2 taxa, 13 obsolete names)
Pagiantha (2 obsolete names)
Palmerocassia (1 obsolete name)
Palmifolium (1 obsolete name)
Pancratium (1 obsolete name)
Pandanus (1 taxon)
Pandorea (2 taxa, 1 obsolete name)
Panicum (1 taxon, 3 obsolete names)
Panisia (1 obsolete name)
Papaver (7 taxa, 3 obsolete names)
Paphiopedilum (1 taxon)
Papyrius (1 obsolete name)
Parajubaea (1 taxon)
Paraserianthes (1 taxon)
Pariti (2 obsolete names)
Parkinsonia (5 taxa, 1 obsolete name)
Parmentiera (1 taxon)
Parodia (103 taxa, 228 obsolete names)
Parosela (6 obsolete names)
Parrotia (1 taxon)
Parrycactus (1 obsolete name)
Parsonsia (4 obsolete names)
Parthenocissus (4 taxa, 5 obsolete names)
Pascopyrum (1 taxon)
Paspalum (2 taxa)
Passiflora (13 taxa, 2 obsolete names)
Patrinia (3 taxa)
Pattersonia (1 obsolete name)
Paulownia (1 taxon)
Paurotis (1 obsolete name)
Pavonia (1 taxon, 2 obsolete names)
Paxistima (2 taxa)
Pedilanthus (2 obsolete names)
Pediocactus (12 taxa, 82 obsolete names)
Peiranisia (7 obsolete names)
Pelargonium (17 taxa, 17 obsolete names)
Pelecyphora (2 taxa, 6 obsolete names)
Pellaea (4 taxa, 2 obsolete names)
Peltandra (1 taxon)
Peltiphyllum (1 obsolete name)
Peltophorum (1 taxon, 2 obsolete names)
Peniocereus (19 taxa, 4 obsolete names)
Pennisetum (3 taxa)
Penstemon (18 taxa, 7 obsolete names)
Pentaphylloides (2 obsolete names)
Pentapterygium (1 obsolete name)
Pentas (1 taxon)
Peperomia (7 taxa)
Pereskia (19 taxa, 46 obsolete names)
Pereskiopsis (8 taxa, 7 obsolete names)
Pergularia (2 obsolete names)
Pericallis (1 obsolete name)
Perilla (1 taxon, 2 obsolete names)
Perlebia (1 obsolete name)
Pernettya (1 taxon, 1 obsolete name)
Peronocactus (17 obsolete names)
Perovskia (1 taxon)
Persea (1 taxon, 1 obsolete name)
Persicaria (3 obsolete names)
Peruvocereus (7 obsolete names)
Perymenium (1 obsolete name)
Petasites (1 taxon)
Petrea (1 taxon, 1 obsolete name)
Petrosedum (1 obsolete name)
Petroselinum (1 taxon, 3 obsolete names)
Petunia (1 taxon)
Peucedanum (1 obsolete name)
Peyotl (2 obsolete names)
Pfeiffera (13 obsolete names)
Phacelia (2 taxa)
Phaedranthus (1 obsolete name)
Phalaris (1 taxon, 1 obsolete name)
Phalaroides (1 obsolete name)
Pharbitis (2 obsolete names)
Phaseolus (1 taxon, 2 obsolete names)
Phedimus (1 obsolete name)
Phegopteris (2 taxa, 1 obsolete name)
Phellosperma (4 obsolete names)
Phemeranthus (1 obsolete name)
Phenianthus (1 obsolete name)
Philadelphus (6 taxa, 9 obsolete names)
Philippicereus (1 obsolete name)
Phillyrea (1 taxon, 1 obsolete name)
Philodendron (17 taxa, 7 obsolete names)
Philotheca (1 taxon)
Phlebodium (1 taxon)
Phlomis (3 taxa, 1 obsolete name)
Phlox (17 taxa, 3 obsolete names)
Phoenix (12 taxa, 3 obsolete names)
Pholidia (1 obsolete name)
Phormium (2 taxa)
Photinia (6 taxa, 5 obsolete names)
Phygelius (3 taxa)
Phyla (1 taxon, 2 obsolete names)
Phyllanthus (1 obsolete name)
Phyllitis (2 obsolete names)
Phyllocactus (33 obsolete names)
Phyllocalyx (1 obsolete name)
Phyllostachys (7 taxa, 2 obsolete names)
Physalis (3 taxa, 2 obsolete names)
Physocarpus (4 taxa, 2 obsolete names)
Physostegia (1 taxon, 3 obsolete names)
Piaranthus (3 taxa)
Picea (8 taxa, 8 obsolete names)
Pieris (7 taxa, 1 obsolete name)
Pierrebraunia (1 obsolete name)
Pilea (4 taxa)
Pilocanthus (1 obsolete name)
Pilocereus (105 obsolete names)
Pilocopiapoa (1 obsolete name)
Pilosocereus (46 taxa, 88 obsolete names)
Pimelea (2 taxa, 2 obsolete names)
Pimenta (2 taxa)
Pimpinella (1 taxon)
Pinanga (2 taxa)
Pinus (42 taxa, 27 obsolete names)
Piper (2 taxa)
Piptanthocereus (31 obsolete names)
Piscidia (3 obsolete names)
Pisonia (2 obsolete names)
Pistacia (5 taxa, 7 obsolete names)
Pitcairnia (1 taxon, 5 obsolete names)
Pithecellobium (4 obsolete names)
Pittosporum (9 taxa, 2 obsolete names)
Plantago (1 taxon, 7 obsolete names)
Platanus (4 taxa, 1 obsolete name)
Platycerium (2 taxa)
Platycladus (1 taxon)
Platycodon (1 taxon)
Platyopuntia (40 obsolete names)
Plecostachys (1 taxon)
Plectranthus (5 taxa, 1 obsolete name)
Pleioblastus (5 taxa, 1 obsolete name)
Pleione (1 taxon)
Pleiospilos (7 taxa, 4 obsolete names)
Pleomele (1 obsolete name)
Pleuraphis (1 taxon)
Pleuropterus (2 obsolete names)
Plumbago (2 taxa, 4 obsolete names)
Plumeria (4 taxa, 1 obsolete name)
Poa (3 taxa, 2 obsolete names)
Podocarpus (8 taxa, 5 obsolete names)
Podophyllum (2 taxa, 1 obsolete name)
Podranea (1 taxon)
Poecilodermis (1 obsolete name)
Poellnitzia (1 taxon, 1 obsolete name)
Pogostemon (1 taxon, 2 obsolete names)
Poinciana (8 obsolete names)
Poincianella (1 obsolete name)
Poinsettia (3 obsolete names)
Polaskia (2 taxa)
Polemonium (3 taxa, 1 obsolete name)
Polianthes (39 obsolete names)
Poliomintha (3 taxa)
Polygala (2 taxa)
Polygonatum (3 taxa, 5 obsolete names)
Polygonum (10 taxa, 4 obsolete names)
Polypodium (2 taxa, 6 obsolete names)
Polyscias (4 taxa, 3 obsolete names)
Polystichum (7 taxa, 4 obsolete names)
Pontederia (1 taxon, 3 obsolete names)
Poponax (1 obsolete name)
Populus (11 taxa, 27 obsolete names)
Porfiria (2 obsolete names)
Porphyrocoma (1 taxon)
Porteranthus (1 taxon)
Portulaca (3 taxa, 5 obsolete names)
Portulacaria (1 taxon, 2 obsolete names)
Potentilla (7 taxa, 14 obsolete names)
Poterium (2 obsolete names)
Pothos (1 obsolete name)
Pourthiaea (1 obsolete name)
Pouteria (2 taxa)
Praecereus (6 taxa, 6 obsolete names)
Pratia (1 taxon, 1 obsolete name)
Primula (18 taxa, 2 obsolete names)
Pritchardia (1 taxon)
Prochnyanthes (3 obsolete names)
Prosopis (7 taxa, 7 obsolete names)
Prostanthera (2 taxa)
Protasparagus (3 obsolete names)
Protea (2 taxa)
Prunella (4 taxa)
Prunus (28 taxa, 7 obsolete names)
Psedera (2 obsolete names)
Pseudoacanthocereus (2 taxa, 1 obsolete name)
Pseudobombax (1 taxon)
Pseudobravoa (1 obsolete name)
Pseudocalymma (1 obsolete name)
Pseudocassia (1 obsolete name)
Pseudocydonia (1 taxon)
Pseudoespostoa (2 obsolete names)
Pseudogynoxys (1 obsolete name)
Pseudolarix (1 taxon)
Pseudolobivia (31 obsolete names)
Pseudomammillaria (4 obsolete names)
Pseudomitrocereus (1 obsolete name)
Pseudonopalxochia (1 obsolete name)
Pseudopanax (3 taxa)
Pseudopilocereus (48 obsolete names)
Pseudorhipsalis (6 taxa, 2 obsolete names)
Pseudosasa (1 taxon)
Pseudotephrocactus (1 obsolete name)
Pseudotsuga (2 taxa, 2 obsolete names)
Pseudozygocactus (2 obsolete names)
Psidium (4 taxa, 3 obsolete names)
Psilostrophe (2 taxa)
Psoralea (1 taxon)
Psorothamnus (1 taxon)
Psylliostachys (1 taxon)
Ptelea (1 taxon, 1 obsolete name)
Pteretis (2 obsolete names)
Pteridium (1 taxon)
Pteris (4 taxa, 1 obsolete name)
Pterocactus (9 taxa, 10 obsolete names)
Pterocarya (1 taxon)
Pterocereus (2 obsolete names)
Pterodiscus (1 taxon)
Pterostyrax (1 taxon)
Ptychosperma (1 taxon)
Puebloa (3 obsolete names)
Pulmonaria (4 taxa, 2 obsolete names)
Pulsatilla (1 obsolete name)
Puna (3 obsolete names)
Punctillaria (1 obsolete name)
Punica (1 taxon)
Purgosea (1 obsolete name)
Purshia (2 taxa, 1 obsolete name)
Puschkinia (1 taxon)
Puya (6 taxa, 1 obsolete name)
Pygmaeocereus (3 taxa, 3 obsolete names)
Pymaeocereus (1 obsolete name)
Pyracantha (5 taxa, 1 obsolete name)
Pyrethropsis (1 obsolete name)
Pyrethrum (3 obsolete names)
Pyrostegia (1 taxon, 1 obsolete name)
Pyrrhocactus (93 obsolete names)
Pyrrosia (1 taxon)
Pyrus (7 taxa, 11 obsolete names)

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