Last updated October 1, 2009
| Name | Family | Nativity |
| Pacherocactus orcuttii | Cactaceae | Mexico |
| Pachycereus fulviceps | Cactaceae | Mexico |
| Pachycereus fulviceps hybrid | Cactaceae | |
| Pachycereus gatesii | Cactaceae | Mexico |
| Pachycereus gaumeri | Cactaceae | SW U.S. to Guatemala |
| Pachycereus grandis | Cactaceae | Mexico |
| Pachycereus marginatus | Cactaceae | Mexico |
| Pachycereus montanus | Cactaceae | |
| Pachycereus pecten-aboriginum | Cactaceae | Mexico |
| Pachycereus pringlei | Cactaceae | Mexico |
| Pachycereus schottii | Cactaceae | SW Arizona to NW Mexico |
| Pachycereus schottii f. monstrose | Cactaceae | SW Arizona to NW Mexico |
| Pachycereus sp. | Cactaceae | |
| Pachycereus weberi | Cactaceae | Mexico |
| Pachycormus discolor | Anacardiaceae | Baja California |
| Pachyphytum aff. sp. | Crassulaceae | |
| Pachyphytum hookeri | Crassulaceae | Mexico |
| Pachyphytum sp. | Crassulaceae | |
| Pachypodium bispinosum | Apocynaceae | South Africa |
| Pachypodium cf. lamerei | Apocynaceae | Madagascar |
| Pachypodium geayi | Apocynaceae | SW Madagascar |
| Pachypodium lamerei | Apocynaceae | Madagascar |
| Pachypodium lamerei v. ramosum | Apocynaceae | Madagascar |
| Pachypodium mikea | Apocynaceae | Madagascar |
| Pachypodium rosulatum | Apocynaceae | Madagascar |
| Pachypodium succulentum | Apocynaceae | South Africa |
| Paeonia suffruticosa | Paeoniaceae | |
| Pancratium maritimum | Amaryllidaceae | Mediterranean, SW Europe |
| Pandanus tectorius | Pandanaceae | Tahiti |
| Pandorea jasminoides cv. Alba | Bignoniaceae | Australia |
| Parajubaea cocoides | Arecaceae | Ecuador |
| Parajubaea torallyi | Arecaceae | Bolivia |
| Parajubaea torallyi v. torallyi | Arecaceae | Bolivia |
| Parodia ocampoi | Cactaceae | Bolivia(Cochabamba) |
| Paspalum quadrifolia | Poaceae | New World Tropics |
| Passiflora citrina | Passifloraceae | Honduras |
| Passiflora cv. Coral Sea | Passifloraceae | |
| Passiflora cv. Lavender Lady | Passifloraceae | |
| Passiflora membranacea | Passifloraceae | Mexico to Panama |
| Passiflora sanguinolenta | Passifloraceae | Ecuador |
| Passiflora vitifolia | Passifloraceae | Cen to South America |
| Passiflora x alatocaerulea | Passifloraceae | |
| Paulownia tomentosa | Scrophulariaceae | C & W China |
| Pelargonium carnosum | Geraniaceae | South Africa |
| Pelargonium citronellum cv. Mabel Gray | Geraniaceae | |
| Pelargonium cotyledonis | Geraniaceae | St. Helena |
| Pelargonium crassipes | Geraniaceae | South Africa |
| Pelargonium crispum cv. French Lace | Geraniaceae | |
| Pelargonium crispum cv. Minor | Geraniaceae | |
| Pelargonium cv. Clorinda | Geraniaceae | |
| Pelargonium cv. Elegance Burgundy | Geraniaceae | |
| Pelargonium cv. Maiden Iced Wine | Geraniaceae | |
| Pelargonium cv. Maiden Red | Geraniaceae | |
| Pelargonium cv. Maiden Rose Pink | Geraniaceae | |
| Pelargonium cv. Royalty White | Geraniaceae | |
| Pelargonium densiflorum cv. Filicifolium | Geraniaceae | |
| Pelargonium fruticosum | Geraniaceae | South Africa |
| Pelargonium graveolens | Geraniaceae | |
| Pelargonium graveolens cv. Mint-Scented Rose | Geraniaceae | |
| Pelargonium graveolens cv. Snowflake | Geraniaceae | |
| Pelargonium ionidiflorum | Geraniaceae | South Africa |
| Pelargonium peltatum cv. L’elegante | Geraniaceae | |
| Pelargonium peltatum x hortorum cv. Alpenglow | Geraniaceae | |
| Pelargonium quercifolium cv. Endsleigh | Geraniaceae | |
| Pelargonium sidoides | Geraniaceae | South Africa |
| Pelargonium sp. | Geraniaceae | |
| Pelargonium tomentosum | Geraniaceae | South Africa |
| Pelargonium x blandfordianum roseum | Geraniaceae | |
| Pelargonium x domesticum cv. Dubonnet | Geraniaceae | |
| Pelargonium x domesticum cv. Excalibur | Geraniaceae | |
| Pelargonium x domesticum cv. Swedish Beauty | Geraniaceae | |
| Pelargonium x domesticum cv. Voodoo | Geraniaceae | |
| Pelargonium x fragrans cv. Nutmeg | Geraniaceae | |
| Pelargonium x fragrans v. variegatum | Geraniaceae | |
| Pelargonium x hortorum cv. Happy Thoughts | Geraniaceae | |
| Pelargonium x hortorum cv. Occold Shield | Geraniaceae | |
| Pelargonium x rutaceum | Geraniaceae | |
| Pelargonium xerophyton | Geraniaceae | Namibia |
| Pellaea falcata | Polypodiaceae | India to Australasia |
| Pellaea viridis | Pteridaceae | Africa to India |
| Peniocereus johnstonii | Cactaceae | NE Mexico |
| Peniocereus serpentinus | Cactaceae | Mexico |
| Peniocereus sp. | Cactaceae | |
| Pennisetum orientale | Poaceae | Central & SW Asia |
| Pennisetum setaceum cv. Rubrum | Poaceae | |
| Penstemon cv. Firebird | Scrophulariaceae | |
| Penstemon cv. Garnet | Scrophulariaceae | |
| Penstemon hybrids | Scrophulariaceae | |
| Peperomia kimnachii | Piperaceae | Bolivia |
| Peperomia sp. | Piperaceae | Ecuador |
| Pereskia grandifolia | Cactaceae | Brazil |
| Pereskia sacharosa | Cactaceae | South America |
| Pereskia sp. | Cactaceae | |
| Pereskia x bleo | Cactaceae | |
| Pereskia zinniiflora | Cactaceae | Cuba |
| Perovskia cv. Blue Spire | Lamiaceae | Pakistan |
| Persea americana cv. Haas | Lauraceae | |
| Persea americana cv. Pinkerton | Lauraceae | |
| Phaius tankervilliae | Orchidaceae | Himalaya to Australia |
| Phalaris arundinacea cv. Picta | Poaceae | |
| Phegopteris decursive-pinnata | Thelypteridaceae | E. Asia |
| Philodendron bipinnatifidum | Araceae | Paraguay, S. Brazil |
| Philodendron sp. | Araceae | |
| Phlebodium pseudoaureum cv. | Polypodiaceae | |
| Phlebodium pseudoaureum cv. Glaucum | Polypodiaceae | |
| Phlomis cashmeriana | Lamiaceae | Afganistan |
| Phlomis lanata | Lamiaceae | Greece |
| Phlomis purpurea | Lamiaceae | Spain |
| Phoenix canariensis | Arecaceae | Spain(Canary Islands) |
| Phoenix canariensis hybrid | Arecaceae | Spain(Canary Islands) |
| Phoenix dactylifera | Arecaceae | African Tropics |
| Phoenix reclinata | Arecaceae | African Tropics |
| Phoenix roebelenii | Arecaceae | Laos |
| Phoenix sylvestris | Arecaceae | India |
| Phoenix theophrastii | Arecaceae | Greece(Crete), Turkey |
| Phormium cv. Duet | Phormiaceae | |
| Phormium cv. Dusky Chief | Phormiaceae | New Zealand |
| Phormium cv. Sundowner | Phormiaceae | |
| Photinia x fraseri | Rosaceae | S & E Asia |
| Phygelius x rectus cv. Moonraker | Scrophulariaceae | |
| Phylica buxifolia | Rhamnaceae | South Africa |
| Phyllanthus reticulatus | Euphorbiaceae | Old World Tropics |
| Phyllitis scolopendrium | Polypodiaceae | Worldwide |
| Phyllostachys bambusoides | Poaceae | China, Japan |
| Phyllostachys nigra | Poaceae | China, Japan |
| Phyllostachys nigra cv. Henon | Poaceae | |
| Phyllostachys viridis cv. Robert Young | Poaceae | |
| Phytolacca dioica | Phytolaccaceae | South America |
| Phytolacca dioica x weberbaueri | Phytolaccaceae | |
| Picea pungens cv. Glauca | Pinaceae | |
| Picea sp. | Pinaceae | |
| Pilosocereus aff. sp. | Cactaceae | |
| Pilosocereus aurisetus | Cactaceae | Brazil |
| Pilosocereus chrysacanthus | Cactaceae | Mexico |
| Pilosocereus chrysostele | Cactaceae | Brazil |
| Pilosocereus diersianus | Cactaceae | Brazil(Goias) |
| Pilosocereus flavipulvinatus | Cactaceae | Brazil |
| Pilosocereus gounellei ssp. zehntneri | Cactaceae | Brazil |
| Pilosocereus lanuginosus | Cactaceae | N South America |
| Pilosocereus leucocephalus | Cactaceae | Mexico to Guatemala & Honduras |
| Pilosocereus pachycladus | Cactaceae | Brazil |
| Pilosocereus purpusii | Cactaceae | Mexico |
| Pilosocereus royenii | Cactaceae | Mexico, Carribean |
| Pilosocereus sp. | Cactaceae | |
| Pilosocereus ulei | Cactaceae | Brazil |
| Pinus brutia ssp. eldarica | Pinaceae | Afghanistan, Turkey |
| Pinus canariensis | Pinaceae | Spain(Canary Islands) |
| Pinus densiflora | Pinaceae | Japan |
| Pinus elliottii | Pinaceae | SE United States |
| Pinus glabra | Pinaceae | SE United States |
| Pinus greggii | Pinaceae | NE Mexico |
| Pinus halepensis | Pinaceae | Mediterranean |
| Pinus martinezii | Pinaceae | Mexico(Michoacan) |
| Pinus monophylla | Pinaceae | California to Baja California |
| Pinus mugo v. mugo | Pinaceae | Central Europe |
| Pinus muricata | Pinaceae | California |
| Pinus oocarpa | Pinaceae | NW Mexico to Nicaragua |
| Pinus pinea | Pinaceae | Mediterranean |
| Pinus radiata | Pinaceae | California to Baja California |
| Pinus strobus | Pinaceae | E North America |
| Pinus taeda | Pinaceae | New Jersey to Texas |
| Pinus thunbergiana | Pinaceae | Japan |
| Pinus thunbergiana cv. Monina | Pinaceae | |
| Pinus torreyana | Pinaceae | San Diego Co, Santa Rosa Is,Ca |
| Pinus x attenuradiata | Pinaceae | |
| Piper aduncum | Piperaceae | N S. America |
| Pisonia umbellifera cv. Variegata | Nyctaginaceae | |
| Pistia stratiotes | Araceae | Pantropical |
| Pitcairnia sp. | Bromeliaceae | |
| Pittosporum crassifolium | Pittosporaceae | New Zealand |
| Pittosporum phillyreoides | Pittosporaceae | Australia |
| Pittosporum tobira | Pittosporaceae | China, Japan |
| Pittosporum tobira cv. Variegata | Pittosporaceae | |
| Pittosporum undulatum | Pittosporaceae | Australia |
| Pittosporum viridiflorum | Pittosporaceae | South Africa |
| Pityrogramma austroamericana | Hemionitidaceae | South America |
| Plagianthus regius | Malvaceae | Australia |
| Plantago sp. | Plantaginaceae | |
| Platanus racemosa | Platanaceae | S California to Baja CA |
| Platycerium andinum | Polypodiaceae | Peru, Bolivia |
| Platycerium bifurcatum | Polypodiaceae | Australia |
| Platycerium bifurcatum | Polypodiaceae | E. Australia |
| Platycerium bifurcatum cv. Netherlands | Polypodiaceae | |
| Platycerium bifurcatum cv. Roberts | Polypodiaceae | |
| Platycerium bifurcatum cv. Ziesenhenne | Polypodiaceae | |
| Platycerium bifurcatum v. venosum | Polypodiaceae | NE Australia |
| Platycerium cv. Jimmy | Polypodiaceae | |
| Platycerium cv. Pumila | Polypodiaceae | |
| Platycerium hillii | Polypodiaceae | Australia |
| Platycerium sp. | Polypodiaceae | |
| Platycerium superbum | Polypodiaceae | |
| Platycerium superbum | Polypodiaceae | Australia |
| Platycerium willinckii | Polypodiaceae | Indonesia |
| Platycerium willinckii | Polypodiaceae | Indonesia(Java) |
| Platycerium willinckii cv. Lemoinei | Polypodiaceae | |
| Platycerium willinckii cv. Scofield | Polypodiaceae | |
| Plectocomia elongata | Arecaceae | Indonesia |
| Plectranthus argentatus | Lamiaceae | Australia(Queensland) |
| Plectranthus ciliatus cv. Drege | Lamiaceae | |
| Plectranthus fruticosus | Lamiaceae | South Africa |
| Plectranthus socotranus | Lamiaceae | Yemen |
| Plectranthus sp. | Lamiaceae | |
| Pleioblastus pygmaeus | Poaceae | Japan |
| Pleioblastus viridi-striatus | Poaceae | Japan |
| Pleomele hawaiiensis | Agavaceae | Hawaii |
| Plumbago auriculata cv. Imperial Blue | Plumbaginaceae | |
| Plumeria rubra cv. Guillot’s Sunset | Apocynaceae | |
| Plumeria rubra cv. Hawaiian Yellow | Apocynaceae | |
| Plumeria rubra cv. Nelly’s White | Apocynaceae | |
| Plumeria sp. | Apocynaceae | |
| Poa costiniana | Poaceae | Australia |
| Podocarpus alpinus | Podocarpaceae | SE Australia |
| Podocarpus elatus | Podocarpaceae | Australia |
| Podocarpus macrophylla | Podocarpaceae | Japan |
| Podocarpus totara | Podocarpaceae | New Zealand |
| Polaskia chende | Cactaceae | S Mexico(Puebla, Oaxaca) |
| Polaskia chichipe | Cactaceae | Mexico |
| Polygala x dalmaisiana | Polygalaceae | |
| Polypodium formosanum cv. Cristatum | Polypodiaceae | |
| Polypodium guttatum | Polypodiaceae | Mexico |
| Polypodium scouleri | Polypodiaceae | Canada(Br. Columbia) to Cal. |
| Polypodium sp. | Polypodiaceae | |
| Polyscias sambucifolia | Araliaceae | Australia |
| Polystichum acrostichoides | Polypodiaceae | E North America |
| Polystichum munitum | Polypodiaceae | Alaska to Monterey, California |
| Polystichum polyblepharum | Polypodiaceae | Asia |
| Polystichum setiferum | Polypodiaceae | Europe |
| Polystichum tsus-simense | Polypodiaceae | China, Japan, Korea |
| Polystichum x dycei | Dryopteridaceae | |
| Pomaderris pilifera | Rhamnaceae | Australia |
| Portea grandibracteata | Bromeliaceae | Brazil |
| Portea petropolitana v. extensa | Bromeliaceae | Brazil |
| Portea silveirae | Bromeliaceae | Brazil |
| Portulacaria afra | Portulacaceae | South Africa |
| Praecereus cavendishii | Cactaceae | S Brazil, Argentina, Paraguay |
| Praecereus euchlorus ssp. diffusa | Cactaceae | S Ecuador, N Peru |
| Praecereus sp. | Cactaceae | |
| Pratia pedunculata | Campanulaceae | |
| Pritchardia beccariana | Arecaceae | Hawaii |
| Pritchardia hillebrandii | Arecaceae | Hawaii |
| Protasparagus africanus | Asparagaceae | S & SW Africa |
| Protasparagus densiflorus cv. Cwebe | Asparagaceae | |
| Protasparagus densiflorus cv. Flagstaff | Asparagaceae | |
| Protasparagus densiflorus cv. Mazeppa | Asparagaceae | |
| Protasparagus densiflorus cv. Meyers | Asparagaceae | |
| Protasparagus densiflorus cv. Sprengeri | Asparagaceae | |
| Protasparagus macowanii | Asparagaceae | South Africa |
| Protasparagus retrofractus | Asparagaceae | South Africa |
| Protasparagus virgatus | Asparagaceae | South Africa |
| Prunus armeniaca cv. Gold Kist | Rosaceae | |
| Prunus armeniaca cv. Katy | Rosaceae | |
| Prunus armeniaca cv. Lorna | Rosaceae | |
| Prunus armeniaca cv. Newcastle | Rosaceae | |
| Prunus armeniaca cv. Royal | Rosaceae | |
| Prunus armeniaca x domestica | Rosaceae | |
| Prunus armeniaca x domestica cv. Dapple Dandy | Rosaceae | |
| Prunus armeniaca x domestica cv. Flavor Delight | Rosaceae | |
| Prunus armeniaca x domestica cv. Flavor Queen | Rosaceae | |
| Prunus avium cv. Craig’s Crimson | Rosaceae | |
| Prunus avium cv. Stella | Rosaceae | |
| Prunus avium x domestica cv. Delight | Rosaceae | |
| Prunus avium x domestica cv. Sprite | Rosaceae | |
| Prunus campanulata | Rosaceae | Taiwan, Japan(Ryukyu Is.) |
| Prunus domestica | Rosaceae | |
| Prunus domestica cv. | Rosaceae | |
| Prunus domestica cv. Burgundy | Rosaceae | |
| Prunus domestica cv. Howard Miracle | Rosaceae | |
| Prunus domestica cv. Laroda | Rosaceae | |
| Prunus domestica ssp. italica cv. Green Gage | Rosaceae | |
| Prunus domestica v. italica cv. Green Gage | Rosaceae | |
| Prunus dulcis cv. All-in-One | Rosaceae | |
| Prunus dulcis cv. Garden Prince | Rosaceae | |
| Prunus dulcis cv. Nonpareil | Rosaceae | |
| Prunus dulcis cv. Price | Rosaceae | |
| Prunus ilicifolia | Rosaceae | California and Baja, Ca |
| Prunus ilicifolia ssp. lyonii | Rosaceae | California |
| Prunus ilicifolia ssp. lyonii | Rosaceae | USA |
| Prunus laurocerasus | Rosaceae | SE Europe to SW Asia |
| Prunus persica cv. August Pride | Rosaceae | |
| Prunus persica cv. Australian Saucer | Rosaceae | |
| Prunus persica cv. Babcock | Rosaceae | |
| Prunus persica cv. Earlitreat | Rosaceae | |
| Prunus persica cv. Edwards Ambrosia | Rosaceae | |
| Prunus persica cv. Midpride | Rosaceae | |
| Prunus persica cv. Ventura | Rosaceae | |
| Prunus persica v. nucipersica cv. Arctic Glo | Rosaceae | |
| Prunus persica v. nucipersica cv. Arctic Star | Rosaceae | |
| Prunus persica v. nucipersica cv. Desert Dawn | Rosaceae | |
| Prunus persica v. nucipersica cv. Double Delight | Rosaceae | |
| Prunus persica v. nucipersica cv. Edwards Divinity | Rosaceae | |
| Prunus persica v. nucipersica cv. Fantasia | Rosaceae | |
| Prunus persica v. nucipersica cv. Panamint | Rosaceae | |
| Prunus salicina cv. Beauty | Rosaceae | |
| Prunus salicina cv. Friar | Rosaceae | |
| Prunus salicina cv. Santa Rosa | Rosaceae | |
| Prunus salicina cv. Satsuma | Rosaceae | |
| Prunus sp. | Rosaceae | |
| Pseudananas sagenarius | Bromeliaceae | Brazil, Paraguay |
| Pseudobombax elipticum | Bombacaceae | Mexico |
| Pseudobombax ellipticum | Bombacaceae | Mexico |
| Pseudorhipsalis ramulosa | Cactaceae | Mexico to Bolivia |
| Psidium littorale v. longipes | Myrtaceae | Brazil |
| Psilotum nudum | Psilotaceae | |
| Psoralea pinnata | Fabaceae | South Africa(E. Cape Province) |
| Pteris calderi | Pteridaceae | |
| Pteris cretica | Polypodiaceae | |
| Pteris cretica cv. Rivertoniana | Pteridaceae | |
| Pteris cretica cv. Wimsettii | Polypodiaceae | |
| Pteris cretica v. nervosa | Pteridaceae | |
| Pteris quadriaurita v. argyraea | Polypodiaceae | India |
| Pteris tremula | Polypodiaceae | Australia, New Zealand |
| Pteris vittata | Polypodiaceae | Worldwide |
| Pteris wallichiana | Pteridaceae | |
| Pterocactus aff. fischeri | Cactaceae | Argentina |
| Pterocactus fischeri | Cactaceae | Argentina |
| Pterocactus sp. | Cactaceae | Argentina |
| Punica granatum cv. Wonderful | Punicaceae | |
| Puya alpestris | Bromeliaceae | Chile |
| Puya coerulea | Bromeliaceae | Chile |
| Puya colima x humilis | Bromeliaceae | |
| Puya dyckioides | Bromeliaceae | Argentina |
| Puya humilis | Bromeliaceae | Bolivia |
| Puya laxa | Bromeliaceae | Chile |
| Puya mirabilis | Bromeliaceae | Argentina, Bolivia |
| Puya sp. | Bromeliaceae | |
| Puya venusta | Bromeliaceae | Chile |
| Pyrrosia hastata | Polypodiaceae | |
| Pyrrosia lingua | Polypodiaceae | Asia |
| Pyrrosia lingua cv. Variegata | Polypodiaceae | |
| Pyrrosia shearei | Polypodiaceae | S.E. Asia |
| Pyrrosia sp. | Polypodiaceae | |
| Pyrus communis cv. | Rosaceae | |
| Pyrus communis cv. Flordahome | Rosaceae | |
| Pyrus communis cv. Hood | Rosaceae | |
| Pyrus communis cv. Kieffer | Rosaceae | |
| Pyrus communis cv. Monterrey | Rosaceae | |
| Pyrus cv. 20th Century | Rosaceae | |
| Pyrus cv. Kieffer | Rosaceae | |
| Pyrus cv. Shinko | Rosaceae | |
| Pyrus cv. Shinseiki | Rosaceae | |
| Pyrus cv. Tsu Li | Rosaceae | |
| Pyrus cv. Ya Li | Rosaceae |
