In 2014, a molecular phylogeneticstudy of the lamiids (aka Garryidae) resolved the anomalous genus Pteleocarpa as sister to (other) Gelsemiaceae.[4] The authors of that study believe that Gelsemiaceae should be expanded to include Pteleocarpa. The APG IV system published in 2016 includes Pteleocarpa in Gelsemiaceae.[5]
^Lena Struwe, Victor A. Albert, and Birgitta Bremer. 1994. "Cladistics and family level classification of the Gentianales". Cladistics10(2):175-206. doi:10.1111/j.1096-0031.1994.tb00171.x
^Nancy F. Refulio-Rodriguez and Richard G. Olmstead. 2014. "Phylogeny of Lamiidae". American Journal of Botany101(2):287-299. doi:10.3732/ajb.1300394.