Taxonomic List	EGF	ICRA
Pachira Aubl.	5:231	AMERICAN PUBLIC GARDENS ASSOCIATION
Pachistima Raf. orth. var. Paxistema Raf.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pachycornia Hook. f.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachylarnax Dandy	-	Currently no ICRA is available for this entry
Pachymitus O. E. Schulz	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachynema R. Br. ex DC.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pachysandra Michx.	5:181	AMERICAN PUBLIC GARDENS ASSOCIATION
Pachystegia Cheeseman = Olearia Moench	6:597	AMERICAN PUBLIC GARDENS ASSOCIATION
Paederia L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 (ESA) - Cactaceae Juss. Tribe Hylocereeae
Palaquium Blanco	5:567	AMERICAN PUBLIC GARDENS ASSOCIATION
Paliavana Vand.	-	THE GESNERIAD SOCIETY, INC.
Palisota Rchb.	-	TRADESCANTIA HUB
Paliurus Mill.	5:189	AMERICAN PUBLIC GARDENS ASSOCIATION
Pamianthe Stapf	1:321	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Panax L.	5:372	AMERICAN PUBLIC GARDENS ASSOCIATION
Pancratium L.	1:320	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Pandanus Parkinson	2:113	AMERICAN PUBLIC GARDENS ASSOCIATION
Pandorea (Endl.) Spach	6:353	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pangium Reinw.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Paraboea (C. B. Clarke) Ridl.	-	THE GESNERIAD SOCIETY, INC.
Paractaenum P. Beauv.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paradrymonia Hanst.	-	THE GESNERIAD SOCIETY, INC.
Parahebe W.R.B. Oliv. = Veronica L. sect. Hebe (Comm. ex Juss) Benth.	-	ROYAL NEW ZEALAND INSTITUTE OF HORTICULTURE, 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 PUBLIC GARDENS ASSOCIATION
Parashorea Kurz	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Parasitaxus de Laub.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Parasyringa W. W. Sm. = Ligustrum L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Parkia R. Br.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Parkincidium anon. (Cercidium Tul. × Parkinsonia L.)	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Parkinsonia L.	4:473	AMERICAN PUBLIC GARDENS ASSOCIATION
Parmentiera DC.	6:349	AMERICAN PUBLIC GARDENS ASSOCIATION
Parrotia C. A. Mey.	4:170	AMERICAN PUBLIC GARDENS ASSOCIATION
Parrotiopsis (Nied.) C. K. Schneid.	4:170	AMERICAN PUBLIC GARDENS ASSOCIATION
Parthenocissus Planch.	5:200	AMERICAN PUBLIC GARDENS ASSOCIATION
Paspalidium Stapf	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Passiflora L.	5:258	PASSIFLORA SOCIETY INTERNATIONAL
Patersonia R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Paullinia L.	5:155	AMERICAN PUBLIC GARDENS ASSOCIATION
Paulownia Siebold & Zucc.	6:344	AMERICAN PUBLIC GARDENS ASSOCIATION
Paxistima Raf.	5:179	AMERICAN PUBLIC GARDENS ASSOCIATION
Payena A. DC.	5:568	AMERICAN PUBLIC GARDENS ASSOCIATION
Pearcea Regel	-	THE GESNERIAD SOCIETY, INC.
Pedicellarum M. Hotta	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Pelargonium L'Hér.	5:57	THE PELARGONIUM AND GERANIUM SOCIETY (PAGS)
Peltandra Raf.	2:98	INTERNATIONAL AROID SOCIETY (I.A.S.)
Peltogyne Vogel	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Peltophorum (Vogel) Benth.	4:472	AMERICAN PUBLIC GARDENS ASSOCIATION
Pennantia J. R. Forst. & G. Forst.	5:184	AMERICAN PUBLIC GARDENS ASSOCIATION
Penstemon Schmidel	6:291	AMERICAN PENSTEMON SOCIETY
Pentace Hassk.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentaceras Hook. f.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentachondra R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentaclethra Benth.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentactina Nakai	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentadesma Sabine	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentapera Roxb. = Terminalia L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentapetes L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentapogon R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pentapterygium Klotzsch = Agapetes D. Don ex G. Don	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pentaptilon E. Pritz.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Peperomia Ruiz & Pav.	3:407	AMERICAN PUBLIC GARDENS ASSOCIATION
Pepinia Brongn. ex André	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Peplidium Delile	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Peraphyllum Torr. & A. Gray	4:421	AMERICAN PUBLIC GARDENS ASSOCIATION
Peripentadenia L. S. Sm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pernettya Gaudich. = Gaultheria L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Perrierbambus A. Camus Pharus P. Browne Phyllostachys Sieb. & Zucc.	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Perrottetia Kunth	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Persea Mill.	3:321	AMERICAN PUBLIC GARDENS ASSOCIATION
Persoonia Sm.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pertya Sch. Bip.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 (ESA) - Cactaceae Juss. Tribe Hylocereeae
Petrea L.	6:156	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Petteria C. Presl	4:537	AMERICAN PUBLIC GARDENS ASSOCIATION
Peumus Molina	3:319	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Philadelphus L.	4:303	AMERICAN PUBLIC GARDENS ASSOCIATION
Philageria Mast. (Lapageria Ruiz & Pav. × Philesia Juss.)	1:268	AMERICAN PUBLIC GARDENS ASSOCIATION
Philesia Juss.	1:268	AMERICAN PUBLIC GARDENS ASSOCIATION
Phillyrea L.	5:576	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Phormium J. R. Forst. & G. Forst.	1:290	ROYAL NEW ZEALAND INSTITUTE OF HORTICULTURE, INC.
Photinia Lindl.	4:424	AMERICAN PUBLIC GARDENS ASSOCIATION
Phygelius E. Mey. ex Benth.	6:287	AMERICAN PUBLIC GARDENS ASSOCIATION
Phylica L.	5:193	AMERICAN PUBLIC GARDENS ASSOCIATION
×Phylleliocereus Guill. (Phyllocactus Link (=Epiphyllum Haw.) × Heliocereus (A. Berger) Britton & Rose (=Disocactus Lindl.)) = Disophyllum Johnson	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
×Phyllenicereus Guill. (Phyllocactus Link (=Epiphyllum Haw.) × Selinicereus (A. Berger) Britton & Rose) = Seleniphyllum Rowley	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
Phylliopsis Cullen & Lancaster (Kalmiopsis Rehder × Phyllodoce Salisb.)	5:480	AMERICAN PUBLIC GARDENS ASSOCIATION
Phyllobaea Benth.	-	THE GESNERIAD SOCIETY, INC.
Phyllocactus Link = Epiphyllum Haw.	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
Phyllocladaceae Bessey	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Phyllocladus Rich. & Mirb.	1:74	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Phyllodoce Salisb.	5:479	AMERICAN PUBLIC GARDENS ASSOCIATION
Phyllostylon Capan. ex Benth. & Hook. f.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Phyllota (DC.) Benth.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Phyllothamnus C. K. Schneid. (Phyllodoce Salisb. × Rhodothamnus Rchb.)	5:480	AMERICAN PUBLIC GARDENS ASSOCIATION
Phymatarum M. Hotta	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Phymatocarpus F. Muell.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Physocarpus (Cambess.) Raf.	4:329	AMERICAN PUBLIC GARDENS ASSOCIATION
Physopsis Turcz.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Picconia A. DC.	5:576	AMERICAN PUBLIC GARDENS ASSOCIATION
Picea A. Dietr.	1:95	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Picrasma Blume	5:116	AMERICAN PUBLIC GARDENS ASSOCIATION
Pieris D. Don	5:490	AMERICAN PUBLIC GARDENS ASSOCIATION
Pileanthus Labill.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pileostegia Hook. f. & Thomson = Schizophragma Siebold & Zucc.	4:313	AMERICAN PUBLIC GARDENS ASSOCIATION
Pilgerodendron Florin	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pilidiostigma Burret	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pilocarpus Vahl	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pimelea Banks ex Sol.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pimelia Banks & Sol.	5:236	AMERICAN PUBLIC GARDENS ASSOCIATION
Pimenta Lindl.	5:305	AMERICAN PUBLIC GARDENS ASSOCIATION
Pinaceae Adans.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Pinckneya Michx.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Piptadeniastrum Brenan	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Piptanthus Sweet	4:533	AMERICAN PUBLIC GARDENS ASSOCIATION
Piptospatha N. E. Br.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Piresia Swallen	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Piscidia L.	4:487	AMERICAN PUBLIC GARDENS ASSOCIATION
Pisonia L.	3:132	AMERICAN PUBLIC GARDENS ASSOCIATION
Pistacia L.	5:128	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Pithecoctenium Mart. ex Meisn.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Platanus L.	4:165	AMERICAN PUBLIC GARDENS ASSOCIATION
Platonia Mart.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Platyadenia B. L. Burtt	-	THE GESNERIAD SOCIETY, INC.
Platycarya Siebold & Zucc.	3:17	AMERICAN PUBLIC GARDENS ASSOCIATION
Platycladus Spach	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Platycrater Siebold & Zucc.	4:313	AMERICAN PUBLIC GARDENS ASSOCIATION
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)
Pleioblastus Nakai	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
Pleione D. Don	2:182	ROYAL HORTICULTURAL SOCIETY (RHS) - ORCHIDS
Pleogyne Miers	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pleonotoma Miers	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pleurocarpaea Benth.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Plinia L.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Plocama Aiton	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Plowmanianthus Faden & C.R.Hardy	-	TRADESCANTIA HUB
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 PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Polianthes L.	1:282	AMERICAN PUBLIC GARDENS ASSOCIATION
Poliomintha A. Gray	6:207	AMERICAN PUBLIC GARDENS ASSOCIATION
Poliothyrsis Oliv.	5:249	AMERICAN PUBLIC GARDENS ASSOCIATION
Pollia Thunb.	-	TRADESCANTIA HUB
Polygala L.	5:123	AMERICAN PUBLIC GARDENS ASSOCIATION
Polylepis Ruiz & Pav.	4:386	AMERICAN PUBLIC GARDENS ASSOCIATION
Polymeria R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Polyscias J. R. Forst. & G. Forst.	5:380	AMERICAN PUBLIC GARDENS ASSOCIATION
Polyspatha Benth.	-	TRADESCANTIA HUB
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 PUBLIC GARDENS ASSOCIATION
Poncirus Raf.	5:113	AMERICAN PUBLIC GARDENS ASSOCIATION
Populus L.	3:42	INTERNATIONAL POPLAR COMMISSION, 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 PUBLIC GARDENS ASSOCIATION
Pothoidium Schott	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Pothos L.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Pourouma Aubl.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pouteria Aubl.	5:567	AMERICAN PUBLIC GARDENS ASSOCIATION
Prasium L.	6:227	AMERICAN PUBLIC GARDENS ASSOCIATION
Primula L.	-	AMERICAN PRIMROSE SOCIETY (APS)
Primulina Hance	-	THE GESNERIAD SOCIETY, INC.
Prinsepia Royle	4:461	AMERICAN PUBLIC GARDENS ASSOCIATION
Prionotes R. Br.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Prioria Griseb.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Proboscidea Schmidel	6:371	INTERNATIONAL CARNIVOROUS PLANT SOCIETY (I.C.P.S.)
Pronaya Hügel	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Prosopis L.	4:465	AMERICAN PUBLIC GARDENS ASSOCIATION
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 PUBLIC GARDENS ASSOCIATION
Prumnopitys Phil.	-	ROYAL HORTICULTURAL SOCIETY (RHS) - CONIFERS
Prunus L. , ornamental cultivars only, excluding P. mume Siebold & Zucc.	4:447	AMERICAN PUBLIC GARDENS ASSOCIATION
Prunus mume Siebold & Zucc.	-	MEI FLOWER AND WINTERSWEET BRANCH OF CHINA FLOWER ASSOCIATION - PRUNUS MUME
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 PUBLIC GARDENS ASSOCIATION
Pseudochirita W. T. Wang	-	THE GESNERIAD SOCIETY, INC.
Pseudocydonia (C. K. Schneid.) C. K. Schneid.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
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 (ESA) - Cactaceae Juss. Tribe Hylocereeae
Pseudopanax K. Koch	5:382	AMERICAN PUBLIC GARDENS ASSOCIATION
Pseudoparis H.Perrier	-	TRADESCANTIA HUB
Pseudorhipsalis Britton & Rose	-	EPIPHYLLUM SOCIETY OF AMERICA (ESA) - Cactaceae Juss. Tribe Hylocereeae
Pseudosasa Makino ex Nakai Pseudostachyum Munro Pseudotananthera R. Majumdar Psudocoix A. Camus Puelia Franchet Qiongzhuea Hsueh & Yi Racemobambos Holttum Raddia Bertol.	-	INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR BAMBOOS (POACEAE, TRIBE BAMBUSEAE)
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 PUBLIC GARDENS ASSOCIATION
Psidium L.	5:306	AMERICAN PUBLIC GARDENS ASSOCIATION
Psoralea L.	4:500	AMERICAN PUBLIC GARDENS ASSOCIATION
Ptelea L.	5:111	AMERICAN PUBLIC GARDENS ASSOCIATION
Pteleopsis Engl.	5:336	AMERICAN PUBLIC GARDENS ASSOCIATION
Ptelidium Thouars	5:173	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterocarpus Jacq.	4:486	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterocarya Kunth	3:20	AMERICAN PUBLIC GARDENS ASSOCIATION
Pteroceltis Maxim.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterogyne Tul.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterospermum Schreb.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterostyrax Siebold & Zucc.	5:572	AMERICAN PUBLIC GARDENS ASSOCIATION
Pterygopappus Hook. f.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pterygota Schott & Endl.	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Ptilanthelium Steud.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ptilotus R. Br.	3:201	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Ptychopetalum Benth.	3:118	AMERICAN PUBLIC GARDENS ASSOCIATION
Ptychosema Benth.	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Puckia D. Butcher (Dyckia Schult. & Schult. f. × Puya Molina)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pucohnia G. H. Anderson ex D. A. Beadle (Deuterocohnia Mez × Puya Molina)	-	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pueraria DC.	4:498	AMERICAN PUBLIC GARDENS ASSOCIATION
Pultenaea Sm.	4:528	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Punica L.	5:322	AMERICAN PUBLIC GARDENS ASSOCIATION
Purshia DC. ex Poir.	4:387	AMERICAN PUBLIC GARDENS ASSOCIATION
Puschkinia Adams	1:221	ROYAL GENERAL BULBGROWERS' ASSOCIATION (K.A.V.B.)
Putoria Pers.	6:93	AMERICAN PUBLIC GARDENS ASSOCIATION
Putterlickia Endl.	5:178	AMERICAN PUBLIC GARDENS ASSOCIATION
Puya Molina	2:12	BROMELIAD SOCIETY INTERNATIONAL (B.S.I)
Pycnanthus Warb.	3:317	AMERICAN PUBLIC GARDENS ASSOCIATION
Pycnonia L. A. S. Johnson & B. G. Briggs	-	AUSTRALIAN CULTIVAR REGISTRATION AUTHORITY (ACRA)
Pycnospatha Thorel ex Gagnep.	-	INTERNATIONAL AROID SOCIETY (I.A.S.)
Pyracantha M. Roem.	4:438	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyracomeles Rehder ex Guillaum. (Osteomeles Lindl. × Pyracantha M. Roem.)	4:447	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrenaria Blume	-	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrocydonia Winkler ex Daniel (Cydonia Mill. + Pyrus L.)	4:405	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrola L.	5:416	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyronia Veitch ex Trabut (Cydonia Mill. × Pyrus L.)	4:405	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrostegia C. Presl	6:350	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrularia Michx.	3:120	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyrus L.	4:406	AMERICAN PUBLIC GARDENS ASSOCIATION
Pyxidanthera Michx.	-	AMERICAN PUBLIC GARDENS ASSOCIATION

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