Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Dilleniidae Takht. ex Reveal & Tahkt. (1993) see Order Dilleniales DC. ex Bercht. & J.Presl (1820)
       Superorder Malvanae Takht. (1967) see Order Malvales Juss. ex Bercht. & J.Presl (1820)
         Order Malvales Juss. ex Bercht. & J.Presl (1820)
           Family Sterculiaceae Vent. (1807), nom. cons. - cacao family see Family Malvaceae Juss. (1789), nom. cons.
             Subfamily Byttnerioideae Burnett
               Tribe Helictereteae see Tribe Helictereae Schott & Endl. (1831)
                 Genus Pterospermum Schreber (1791), nom. cons.