Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Magnoliidae Novák ex Takht. (1967) - angiosperms
       Superorder Magnolianae Takht. (1967)
         Order Aristolochiales Juss. ex Bercht. & J.Presl (1820) see Order Piperales Bercht. & J.Presl (1820)
           Family Aristolochiaceae Juss. (1789), nom. cons. - birthwort family
             Subfamily Aristolochioideae Burnett
               Tribe Aristolochieae Dumort. ex Spach (1841)
                 1 Genus Isotrema Rafinesque (1819)
                 2 Genus Pararistolochia (Hutchinson & Dalziel) Hutchinson & Dalziel (1928) see Genus Aristolochia L. (1753)
                 3 Genus Euglypha R. Chodat & E. Hassler (1906)
                 4 Genus Holostylis Duchartre (1854)
                 5 Genus Aristolochia L. (1753) - birthworts