Paeoniaceae (Bercht. & J. Presl) Rudolphi, 1830, nom. cons.
Pandaceae Engl. & Gilg, 1913, nom. cons.
Bennettiaceae R. Br. ex Schnizl., 1846-1866, nom. illeg.
Pandanaceae R. Br., 1810, nom. cons.
Freycinetiaceae Brongn. ex Le Maout & Decne., 1868
Papaveraceae Juss., 1789, nom. cons.
Chelidoniaceae Martinov, 1820
Corydalaceae Vest, 1818
Eschscholziaceae Ser., 1847
Fumariaceae DC., 1821, nom. cons.
Platystemonaceae (Rchb. ex Spach) Lilja, 1870
Papilionoideae DC.
Paracryphiaceae Airy Shaw, 1964
Parkeriaceae Hook., 1825, nom. rej.
Ceratopteridaceae Underw., 1900
Parnassiaceae Gray, 1821, nom. cons.
Passifloraceae Juss. ex Kunth, 1817, nom. cons.
Modeccaceae Horan., 1847
Paropsiaceae Dumort., 1829
Smeathmanniaceae Mart. ex Perleb, 1838
Paulowniaceae Nakai, 1949
Pedaliaceae R. Br., 1810, nom. cons.
Sesamaceae R. Br. ex Bercht. & J. Presl, 1820
Pelliceriaceae (Triana & Planch.) L. Beauvis. ex Bullock, 1959
Penaeaceae Sweet ex Guill., 1828, nom. cons.
Pentadiplandraceae Hutch. & Dalziel, 1928
Pentaphragmataceae J. Agardh, 1858
Pentaphylacaceae Engl., 1897, nom. cons.
Pentastemonaceae Duyfjes, 1992
Penthoraceae Rydb. ex Britt., 1901, nom. cons.
Peridiscaceae Kuhlm., 1950, nom. cons.
Petermanniaceae Hutch., 1934, nom. cons.
Petiveriaceae C. Agardh, 1824
Hilleriaceae Nakai, 1942
Riviniaceae C. Agardh, 1824
Seguieriaceae Nakai, 1942
Petrosaviaceae Hutch., 1934, nom. cons.
Phellinaceae (Loes.) Takht., 1967
Philesiaceae Dumort., 1829, nom. cons.
Lapageriaceae Kunth, 1850
Philydraceae Link, 1821, nom. cons.
Phormiaceae J. Agardh, 1858
Dianellaceae Salisb., 1866
Phrymaceae Schauer, 1847, nom. cons.
Phyllocladaceae Bessey, 1907
Phyllonomaceae Small, 1905
Dulongiaceae J. Agardh, 1858, nom. illeg.
Physenaceae Takht., 1985
Phytolaccaceae R. Br., 1818, nom. cons.
Sarcocaceae Raf., 1837
Picramniaceae (Engler) Fernando & Quinn, 1995
Pinaceae Lindl., 1836, nom. cons.
Abietaceae Bercht. & J. Presl, 1820, nom. cons.
Cedraceae Vest, 1818
Piceaceae Gorozh., 1904
Piperaceae C. Agardh, 1824, nom. cons.
Peperomiaceae A.C. Sm., 1981
Pittosporaceae R. Br., 1814, nom. cons.
Plagiogyriaceae Bower, 1926
Plagiopteraceae Airy Shaw, 1964
Plantaginaceae Juss., 1789, nom. cons.
Littorellaceae Gray, 1821
Psylliaceae Horan., 1834
Platanaceae T. Lestib. ex Dumort., 1829, nom. cons.
Platyzomataceae Nakai, 1950
Plocospermataceae Hutch., 1973
Plumbaginaceae Juss., 1789, nom. cons.
Aegialitidaceae Lincz., 1968
Armeriaceae Horan., 1834
Limoniaceae Ser., 1851
Staticaceae Cassel, 1817
Poaceae (R. Br.) Barnh., 1895, nom. cons.
Aegilopaceae Martinov, 1820
Agrostidaceae Burnett, 1835
Alopecuraceae Martinov, 1820
Andropogonaceae Martinov, 1820
Anomochloaceae Nakai, 1943
Anthoxanthaceae (Link) Pfeiff., 1872
Arundinaceae (Dumort.) Hochst., 1850
Arundinellaceae (Stapf) Herter, 1940
Asperellaceae Link ex Pfeiff., 1872
Avenaceae Martinov, 1820
Bambusaceae Burnett, 1835
Chaeturaceae Link ex Pfeiff., 1872
Chloridaceae (Bercht. & J. Presl) Herter, 1940
Coleanthaceae (Link) Pfeiff., 1873
Cynosuraceae (Link) Pfeiff., 1873
Echinariaceae (Link) Pfeiff., 1873
Ehrhartiaceae (Link) Pfeiff., 1874
Eragrostidaceae (Stapf) Herter, 1940
Festucaceae Spreng. ex Pfeiff., 1873
Glyceriaceae (Link) Pfeiff., 1874
Gramineae Juss., 1789, nom. cons. et nom. alt.
Hordeaceae Burnett, 1835
Lepturaceae (Dumort.) Herter, 1940
Maydaceae Martinov, 1820, nom. illeg.
Melicaceae Martinov, 1820
Miliaceae Burnett, 1835
Nardaceae Martinov, 1820
Oryzaceae Burnett, 1835
Panicaceae Voigt, 1845
Pappophoraceae (Kunth) Herter, 1940
Paspalaceae (Link) Pfeiff., 1873
Parianaceae Nakai, 1943
Phalaridaceae Burnett, 1835
Pharaceae (Stapf) Herter, 1940
Saccharaceae Martinov, 1820
Spartinaceae Burnett, 1835
Sporobolaceae Herter, 1941
Stipaceae Burnett, 1835
Streptochaetaceae Nakai, 1943
Tristeginaceae (Link) Herter, 1940, nom. illeg.
Triticaceae Hochst., 1848
Zeaceae A. Kern., 1891
Podoaceae Baill. ex Franch., 1889
Podocarpaceae Endl., 1847, nom. cons.
Nageiaceae D.Z. Fu, 1992
Pherosphaeraceae (Pilger) Nakai, 1938
Podophyllaceae DC., 1821, nom. cons.
Podostemaceae Rich. ex C. Agardh, 1822, nom. cons.
Marathraceae Dumort., 1829
Philocrenaceae Bongard, 1834
Tristichaceae Willis, 1915
Polemoniaceae Juss., 1789, nom. cons.
Cobaeaceae D. Don, 1824
Polygalaceae R. Br., 1814, nom. cons.
Diclidantheraceae J. Agardh, 1858, nom. cons.
Moutabeaceae Endl., 1841
Polygonaceae Juss., 1789, nom. cons.
Calligonaceae Khalk., 1985
Eriogonaceae (Dumort.) G. Don, 1839
Persicariaceae Adans., 1763
Rumicaceae Martinov, 1820
Polypodiaceae Bercht. & J. Presl, 1820
Drynariaceae R.C. Ching, 1978
Loxogrammaceae R.C. Ching ex Pic. Serm., 1975
Platyceriaceae (B.K. Nayar) Ching, 1978
Pontederiaceae Kunth, 1816, nom. cons.
Heterantheraceae J. Agardh, 1858
Unisemataceae Raf., 1837
Portulacaceae Juss., 1789, nom. cons.
Montiaceae Raf., 1820
Posidoniaceae Hutch., 1934, nom. cons.
Cauliniaceae J. Presl, 1846, nom. illeg.
Potamogetonaceae Dumort., 1829, nom. cons.
Hydrogetonaceae Link, 1829
Pottingeriaceae (Engl.) Takht., 1987
Primulaceae Vent., 1799, nom. cons.
Anagallidaceae Adans., 1763
Coridaceae J. Agardh, 1858
Lysimachiaceae Durande, 1782
Samolaceae Raf., 1820
Prioniaceae S.L. Munro & H.P. Linder, 1998
Proteaceae Juss., 1789, nom. cons.
Lepidocarpaceae Schultz Sch., 1832, nom. illeg.
Psilotaceae Eichler, 1886
Tmesipteridaceae Nakai, 1943
Psiloxylaceae Croizat, 1960
Ptaeroxylaceae J.-F. Leroy, 1960
Pteridaceae E.D.M. Kirchn., 1831
Acrostichaceae Mett. ex A.B. Frank, 1877, nom. rej.
Pteridophyllaceae (Murb.) Nakai ex Reveal & Hoogland, 1991
Pterostemonaceae Small, 1905, nom. cons.