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 Periplocoideae Endl. Genus Streptocaulon R. Wight & Arnott, in R. Wight (1834)