Keener, B. R. . “A New Hexastylis (Aristolochiaceae) from Northeast Alabama (U.S.A.) With Notes on the Species ‘groups’ Within the Genus”. Journal of the Botanical Research Institute of Texas, vol. 14, no. 2, Dec. 2020, pp. 161-6, doi:10.17348/jbrit.v14.i2.999.