Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Magnoliopsida Brongn. (1843)
     Subclass Lamiidae Takht. ex Reveal (1993) see [unranked] lamiids
       Superorder Gentiananae Thorne ex Reveal (1992) see Order Gentianales Juss. ex Bercht. & J.Presl (1820)
         Order Apocynales R.Br. ex Bercht. & J.Presl (1820) see Order Gentianales Juss. ex Bercht. & J.Presl (1820)
           Family Apocynaceae Juss. (1789), nom. cons. - dogbane family
             Subfamily Asclepiadoideae Burnett
               Tribe Asclepiadeae Duby (1828)
                 Genus Pentastelma Tsiang & P.T.Li