Taxonomic Listing of genera and families with an ICRA
Alphabetical List: P


Reference under EGF refers to volume and page of the entry in the six-volume European Garden Flora
published by Cambridge University Press, UK (1984-2000)
Taxonomic List EGF ICRA
Pachira Aubl. 5:231 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pachistima Raf. orth. var. Paxistema Raf. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pachycornia Hook. f. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachylarnax Dandy - MAGNOLIA SOCIETY, INC.
Pachymitus O. E. Schulz - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachynema R. Br. ex DC. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachysandra Michx. 5:181 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pachystegia Cheeseman = Olearia Moench 6:597 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paederia L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paeonia L. 4:18 AMERICAN PEONY SOCIETY
Paeoniaceae Raf. - AMERICAN PEONY SOCIETY
×Paetzara Heath (Aporocactus Lem. (=Disocactus Lindl.) × Disocactus Lindl. × Heliocereus (A. Berger) Britton & Rose (=Disocactus Lindl.) × Nopalxochia Britton & Rose (=Disocactus Lindl.) = Disocactus Lindl. - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Palaquium Blanco 5:567 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paliavana Vand. - THE GESNERIAD SOCIETY, INC.
Paliurus Mill. 5:189 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pamianthe Stapf 1:321 ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Panax L. 5:372 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pancratium L. 1:320 ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pandanus Parkinson 2:113 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pandorea (Endl.) Spach 6:353 AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pangium Reinw. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Panopsis Salisb. ex Knight - PROTEACEAE CULTIVAR REGISTRATION AUTHORITY, NATIONAL DEPARTMENT OF AGRICULTURE (SOUTH AFRICA)
Papuacedrus H. L. Li - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Parabenzoin Nakai = Lindera Thunb. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paraboea (C. B. Clarke) Ridl. - THE GESNERIAD SOCIETY, INC.
Paractaenum P. Beauv. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paradrymonia Hanst. - THE GESNERIAD SOCIETY, INC.
Parakmeria Hu & W. C. Cheng = Magnolia L. - MAGNOLIA SOCIETY, INC.
Parakohleria Wiehler - THE GESNERIAD SOCIETY, INC.
Paramongaia Velarde 1:321 ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Paraneurachne S. T. Blake - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paranomus Salisb. - PROTEACEAE CULTIVAR REGISTRATION AUTHORITY, NATIONAL DEPARTMENT OF AGRICULTURE (SOUTH AFRICA)
Parantennaria Beauverd - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paraserianthes I. C. Nielsen - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parashorea Kurz - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parasitaxus de Laub. - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Parasyringa W. W. Sm. = Ligustrum L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paratephrosia Domin - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pardancanda L. W. Lenz (Belamcanda Adans. × Pardanthopsis (Hance) L. W. Lenz) - ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pardanthopsis (Hance) L. W. Lenz 1:354 ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pardanthus Ker Gawl. = Belamcanda Adans. - ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Parinari Aubl. 4:463 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parkia R. Br. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parkincidium anon. (Cercidium Tul. × Parkinsonia L.) - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parkinsonia L. 4:473 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parmentiera DC. 6:349 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parrotia C. A. Mey. 4:170 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parrotiopsis (Nied.) C. K. Schneid. 4:170 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Parthenocissus Planch. 5:200 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paspalidium Stapf - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Passiflora L. 5:258 PASSIFLORA SOCIETY INTERNATIONAL
Patersonia R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paulheathara Trehane (Disocactus Lindl. × Epiphyllum Haw. × Selenicereus (A. Berger) Britton & Rose) - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Paullinia L. 5:155 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paulownia Siebold & Zucc. 6:344 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Paxistima Raf. 5:179 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Payena A. DC. 5:568 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pearcea Regel - THE GESNERIAD SOCIETY, INC.
Pedicellarum M. Hotta - INTERNATIONAL AROID SOCIETY (I.A.S.)
Pelargonium L'Hér. 5:57 BRITISH AND EUROPEAN GERANIUM SOCIETY (BEGS)
Peltandra Raf. 2:98 INTERNATIONAL AROID SOCIETY (I.A.S.)
Peltogyne Vogel - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Peltophorum (Vogel) Benth. 4:472 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pennantia J. R. Forst. & G. Forst. 5:184 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Penstemon Schmidel 6:291 AMERICAN PENSTEMON SOCIETY
Pentace Hassk. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentaceras Hook. f. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentachondra R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentaclethra Benth. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentactina Nakai - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentadesma Sabine - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentapera Roxb. = Terminalia L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentapetes L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentapogon R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentapterygium Klotzsch = Agapetes D. Don ex G. Don - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pentaptilon E. Pritz. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Peperomia Ruiz & Pav. 3:407 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pepinia Brongn. ex André - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Peplidium Delile - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Peraphyllum Torr. & A. Gray 4:421 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Peripentadenia L. S. Sm. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pernettya Gaudich. = Gaultheria L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Perrottetia Kunth - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Persea Mill. 3:321 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Persoonia Sm. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pertya Sch. Bip. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Petalistigma F. Muell. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Petalostylis R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Petermannia F. Muell. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Petermanniaceae Hutch. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
×Petersenara Heath (Cryptocereus Alexander (=Selenicereus (A. Berger) Britton & Rose) × Heliocereus (A. Berger) Britton & Rose (=Disocactus Lindl.) × Nopalxochia Britton & Rose (=Disocactus Lindl.)) = Disoselenicereus E. Meier - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Petrea L. 6:156 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Petrocodon Hance - THE GESNERIAD SOCIETY, INC.
Petrocosmea Oliv. 6:395 THE GESNERIAD SOCIETY, INC.
Petrophile R. Br. ex Knight - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Petrophytum (Torr. & A. Gray) Rydb. 4:341 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Petteria C. Presl 4:537 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Peumus Molina 3:319 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phacellotrix F. Muell. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phaedranassa Herb. 1:325 ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Phaedranthus Miers = Distictis Mart. ex Meisn. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phebalium Vent. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pheidochloa S. T. Blake - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pheidonocarpa L. E. Skog - THE GESNERIAD SOCIETY, INC.
Phellodendron Rupr. 5:110 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Philadelphus L. 4:303 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Philageria Mast. (Lapageria Ruiz & Pav. × Philesia Juss.) 1:268 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Philesia Juss. 1:268 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phillyrea L. 5:576 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Philodendron Schott - INTERNATIONAL AROID SOCIETY (I.A.S.)
Philotheca Rudge - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Philydrella Caruel - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phinaea Benth. - THE GESNERIAD SOCIETY, INC.
Phlebocarya R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phlegmatospermum O. E. Schulz - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phoebe Nees 3:321 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phormium J. R. Forst. & G. Forst. 1:290 ROYAL NEW ZEALAND INSTITUTE OF HORTICULTURE, INC.
Photinia Lindl. 4:424 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phygelius E. Mey. ex Benth. 6:287 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phylica L. 5:193 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
×Phylleliocereus Guill. (Phyllocactus Link (=Epiphyllum Haw.) × Heliocereus (A. Berger) Britton & Rose (=Disocactus Lindl.)) = Disophyllum Johnson - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
×Phyllenicereus Guill. (Phyllocactus Link (=Epiphyllum Haw.) × Selinicereus (A. Berger) Britton & Rose) = Seleniphyllum Rowley - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Phylliopsis Cullen & Lancaster (Kalmiopsis Rehder × Phyllodoce Salisb.) 5:480 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phyllobaea Benth. - THE GESNERIAD SOCIETY, INC.
Phyllocactus Link = Epiphyllum Haw. - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Phyllocladaceae Bessey - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Phyllocladus Rich. & Mirb. 1:74 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Phyllodoce Salisb. 5:479 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phyllostylon Capan. ex Benth. & Hook. f. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phyllota (DC.) Benth. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phyllothamnus C. K. Schneid. (Phyllodoce Salisb. × Rhodothamnus Rchb.) 5:480 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Phymatarum M. Hotta - INTERNATIONAL AROID SOCIETY (I.A.S.)
Phymatocarpus F. Muell. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Physocarpus (Cambess.) Raf. 4:329 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Physopsis Turcz. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Picconia A. DC. 5:576 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Picea A. Dietr. 1:95 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Picrasma Blume 5:116 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pieris D. Don 5:490 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pileanthus Labill. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pileostegia Hook. f. & Thomson = Schizophragma Siebold & Zucc. 4:313 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pilgerodendron Florin - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pilidiostigma Burret - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pilocarpus Vahl - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pimelea Banks ex Sol. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pimelia Banks & Sol. 5:236 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pimenta Lindl. 5:305 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pinaceae Adans. - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pinckneya Michx. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pinellia Ten. 2:109 INTERNATIONAL AROID SOCIETY (I.A.S.)
Pinguicula L. 6:405 INTERNATIONAL CARNIVOROUS PLANT SOCIETY (I.C.P.S.)
Pinus L. 1:100 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Piper L. 3:413 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Piptadeniastrum Brenan - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Piptanthus Sweet 4:533 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Piptospatha N. E. Br. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Piscidia L. 4:487 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pisonia L. 3:132 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pistacia L. 5:128 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pistia L. 2:112 INTERNATIONAL AROID SOCIETY (I.A.S.)
Pitcairnia L'Hér. 2:13 BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pithecellobium Mart. 4:470 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pithecoctenium Mart. ex Meisn. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pithocarpa Lindl. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pitinia J. Irvin ex Baskerville (Pepinia Brongn. × Pitcairnia L'Hér.) - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pittosporum Banks ex Gaertn. 4:321 ROYAL NEW ZEALAND INSTITUTE OF HORTICULTURE, INC.
Pityrodia R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Placospermum C. T. White & W. D. Francis - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Plagianthus J. R. Forst. & G. Forst. 5:219 AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Plagiosetum Benth. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Planera J. F. Gmel. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Platanus L. 4:165 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Platonia Mart. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Platyadenia B. L. Burtt - THE GESNERIAD SOCIETY, INC.
Platycarya Siebold & Zucc. 3:17 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Platycladus Spach - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Platycrater Siebold & Zucc. 4:313 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Platylobium Sm. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Platysace Bunge - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Platystemma Wall. - THE GESNERIAD SOCIETY, INC.
Platytheca Steetz - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Plectrachne Henrard - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pleione D. Don 2:182 ROYAL HORTICULTURAL SOCIETY (RHS) - ORCHIDS
Pleogyne Miers - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pleonotoma Miers - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pleurocarpaea Benth. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Plinia L. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Plocama Aiton - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Plumeria L. 6:40 PLUMERIA SOCIETY OF AMERICA, INC.
Podaechmea (Mez) L. B. Sm. & W. J. Kress - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Podalyria Lam. 4:531 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Podocarpaceae Endl. - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Podocarpus L'Hér. ex Pers. 1:75 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Podolasia N. E. Br. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Podolepis Labill. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Podotheca Cass. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Podranea Sprague 6:353 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Polianthes L. 1:282 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Poliomintha A. Gray 6:207 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Poliothyrsis Oliv. 5:249 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Polygala L. 5:123 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Polylepis Ruiz & Pav. 4:386 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Polymeria R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Polyscias J. R. Forst. & G. Forst. 5:380 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Polyxena Kunth - ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pomaderris Labill. 5:193 AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pomax Sol. ex DC. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pometia J. R. Forst. & G. Forst. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Poncirus Raf. 5:113 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Populus L. , forestry cultivars 3:42 INTERNATIONAL POPLAR COMMISSION OF F. A. O.
Poranthera Rudge - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Portea Brongn. ex K. Koch - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Portemea Ariza-Julia (Aechmea Ruiz & Pav. × Portea K. Koch) - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Potentilla fruticosa L. sensu lato - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pothoidium Schott - INTERNATIONAL AROID SOCIETY (I.A.S.)
Pothos L. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Pourouma Aubl. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pouteria Aubl. 5:567 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Prasium L. 6:227 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Primulina Hance - THE GESNERIAD SOCIETY, INC.
Prinsepia Royle 4:461 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Prionotes R. Br. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Prioria Griseb. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Proboscidea Schmidel 6:371 INTERNATIONAL CARNIVOROUS PLANT SOCIETY (I.C.P.S.)
Pronaya Hügel - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Prosopis L. 4:465 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Prostanthera Labill. 6:165 AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Protarum Engl. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Protea L. 3:106 PROTEACEAE CULTIVAR REGISTRATION AUTHORITY, NATIONAL DEPARTMENT OF AGRICULTURE (SOUTH AFRICA)
Proteaceae Juss. , excluding genera endemic to the Australian region - PROTEACEAE CULTIVAR REGISTRATION AUTHORITY, NATIONAL DEPARTMENT OF AGRICULTURE (SOUTH AFRICA)
Protium Burm. f. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Prumnopitys Phil. - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Prunus L. , ornamental cultivars only, excluding P. mume Siebold & Zucc. 4:447 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Prunus mume Siebold & Zucc. - CHINESE MEI FLOWER AND WINTER-SWEET ASSOCIATION
Psammagrostis C. A. Gardner & C. E. Hubb. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Psammomoya Diels & Loes. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pseudaechmea L. B. Sm. & Read - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pseudanamea H. U. Baensch & U. Baensch (Aechmea Ruiz & Pav. × Pseudananas (Hassl.) Harms) - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pseudananas (Hassl.) Harms - BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pseudanthus Sieber ex A. Spreng. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pseudobombax Dugand 5:230 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pseudochirita W. T. Wang - THE GESNERIAD SOCIETY, INC.
Pseudocydonia (C. K. Schneid.) C. K. Schneid. - AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pseudodracontium N. E. Br. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Pseudogaltonia (Kuntze) Engl. - ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pseudohydrosme Engl. - INTERNATIONAL AROID SOCIETY (I.A.S.)
Pseudolarix Gordon 1:98 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pseudomuscari Garbari & Greuter - ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pseudonopalxochia Backeb. = Disocactus Lindl. - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Pseudopanax K. Koch 5:382 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pseudorhipsalis Britton & Rose - EPIPHYLLUM SOCIETY OF AMERICA (E.S.A.)
Pseudotaxus W. C. Cheng - ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pseudotsuga Carrière 1:94 ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pseudoweinmannia Engl. - AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pseudowintera Dandy 3:314 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Psidium L. 5:306 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Psoralea L. 4:500 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Ptelea L. 5:111 AMERICAN ASSOCIATION OF BOTANICAL GARDENS AND ARBORETA (A.A.B.G.A.)
Pteleopsis