For Hebecarpa
Abbott, J.R. 2011. Notes on the disintegration of Polygala (Polygalaceae), with four new genera for the flora of North America. J. Bot. Res. Inst. Texas 5: 125-137.
Abbott, J.R. 2021. Polygalaceae. In Flora of North America Editorial Committee. 2021. Flora of North America north of Mexico. Volume 10, Magnoliophyta: Proteaceae to Elaeagnaceae. Oxford Univ. Press, New York, NY. 456 pp.
Abbott, J.R., and J.F.B. Pastore. 2015. Preliminary synopsis of the genus Hebecarpa (Polygalaceae). Kew Bull. 70: 39.