Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct. Class Magnoliopsida Brongn. (1843) Subclass Caryophyllidae Takht. (1967) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820) Superorder Polygonanae Takht. ex Reveal (1992) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820) Order Polygonales Dumort. (1829) see Order Caryophyllales Juss. ex Bercht. & J.Presl (1820) Family Polygonaceae Juss. (1789), nom. cons. - buckwheat family Subfamily Polygonoideae Eaton Tribe Triplarideae C.A. Mey. (1840) Genus Leptogonum Bentham, in Bentham & Hook.f. (1880)