Pachyanthe, Section – synonym of Intervallatae, Section (Bulbophyllum)
Pachychilus, Genus – synonym of Pachystoma, Genus
Pachyne, Genus – synonym of Phaius, Genus
Pachyrhizanthe, Genus – synonym of Cymbidium, Genus
Pahudiella, Section – synonym of Beccariana, Section (Bulbophyllum)
Paliris, Genus – synonym of Liparis, Genus
Pantlingia, Genus – synonym of Stigmatodactylus, Genus
Papulipetalum, Section (Bulbophyllum)
Papulipetalum, Genus – synonym of Bulbophyllum, Genus
Papulipetalum, Genus – synonym of Papulipetalum, Section (Bulbophyllum)
Paracalanthe, Genus – synonym of Calanthe, Genus
Parapteroceras, Genus – synonym of Tuberolabium, Genus
Parasarcochilus, Genus – synonym of Sarcochilus, Genus
Pattonia, Genus – synonym of Grammatophyllum, Genus
Paxtonia, Genus – synonym of Spathoglottis, Genus
Pedilea, Genus – synonym of Malaxis, Genus
Pedilochilus, Section (Bulbophyllum)
Pedilochilus, Genus – synonym of Bulbophyllum, Genus
Pedilochilus, Genus – synonym of Pedilochilus, Section (Bulbophyllum)
Pedilonum, Section (Dendrobium)
Pelma, Genus – synonym of Bulbophyllum, Genus
Pelma, Genus – synonym of Pelma, Section (Bulbophyllum)
Peltopus, Section (Bulbophyllum)
Peltopus, Genus – synonym of Bulbophyllum, Genus
Peltopus, Genus – synonym of Peltopus, Section (Bulbophyllum)
Peramium, Genus – synonym of Goodyera, Genus
Pesomeria, Genus – synonym of Phaius, Genus
Petrorchis, Genus – synonym of Pterostylis, Genus
Phalaenanthe, Section (Dendrobium)
Phalaenopsis, Section (Phalaenopsis)
Pharochilum, Genus – synonym of Pterostylis, Genus
Pholidota, Section (Pholidota)
Phoringopsis, Genus – synonym of Arthrochilus, Genus
Phreatiopsis, Section (Bulbophyllum)
Phyllorchis, Genus – synonym of Bulbophyllum, Genus
Phyllorkis, Genus – synonym of Bulbophyllum, Genus
Physurus, Genus – synonym of Erythrodes, Genus
Piestobulbon, Section (Bulbophyllum)
Pinalia, Genus – synonym of Eria, Genus
Placostigma, Genus – synonym of Podochilus, Genus
Plantaginea, Section (Habenaria)
Platyacron, Section (Malaxideae)
Platycaulon, Section (Dendrobium)
Platychilus, Section (Malaxideae)
Platyclinis, Section (Dendrochilum)
Platyclinis, Genus – synonym of Dendrochilum, Genus
Platyglossum, Section (Malaxideae)
Platypus, Genus – synonym of Eulophia, Genus
Platysma, Genus – synonym of Podochilus, Genus
Platystreptus, Section (Malaxideae)
Platystylis, Genus – synonym of Liparis, Genus
Pleianthe, Section (Dendrobium)
Pleiophyllum, Section (Malaxideae)
Pleuranthemum, Section (Ceratostylis)
Plexaure, Genus – synonym of Phreatia, Genus
Plocoglottis, Section (Plocoglottis)
Plumatichilos, Genus – synonym of Pterostylis, Genus
Podandria, Genus – synonym of Habenaria, Genus
Podandriella, Genus – synonym of Habenaria, Genus
Podanthera, Genus – synonym of Epipogium, Genus
Podochilopsis, Genus – synonym of Adenoncos, Genus
Podochilus, Section (Podochilus)
Pododesme, Section (Appendicula)
Podostachys, Section (Malaxideae)
Pogochilus, Genus – synonym of Galeola, Genus
Polyblepharon, Section – synonym of Monanthes, Section (Bulbophyllum)
Polychilos, Genus – synonym of Phalaenopsis, Genus
Polymeres, Section (Bulbophyllum)
Polymeres Blume, Section – synonym of Polymeres, Section (Bulbophyllum)
Polyrhopalon, Section – synonym of Epicrianthes, Section (Bulbophyllum)
Polystylus, Genus – synonym of Phalaenopsis, Genus
Porphyrophyllos, Section (Plocoglottis)
Preptanthe, Section (Calanthe)
Preptanthe, Genus – synonym of Calanthe, Genus
Pseudocoeloglossum, Genus – synonym of Habenaria, Genus
Pseudohemipilia, Genus – synonym of Habenaria, Genus
Pseudoliparis, Section (Malaxideae)
Pseudoliparis, Genus – synonym of Malaxis, Genus
Pseudomacodes, Genus – synonym of Macodes, Genus
Pseudoperistylus, Genus – synonym of Habenaria, Genus
Pseudorchis, Genus – synonym of Liparis, Genus
Psychechilus, Genus – synonym of Zeuxine, Genus
Pterocadetia, Section (Cadetia)
Pterochilus, Genus – synonym of Malaxis, Genus
Ptilocnema, Genus – synonym of Pholidota, Genus
Ptychochilus, Genus – synonym of Tropidia, Genus
Ptychogyne, Genus – synonym of Coelogyne, Genus