References
For Cynanchum
Endress, M.E., U. Meve, D.J. Middleton, and S. Liede-Schumann. 2018. Apocynaceae. In Kadereit, J., & V. Bittrich. 2018. The families and genera of flowering plants. XV. Flowering plants. Eudicots. Apiales, Gentianales (except Rubiaceae). Springer, Cham. Google Scholar
Fishbein, M. 2023b. Cynanchum. In Flora of North America Editorial Committee. 2023c. Flora of North America north of Mexico. Volume 14, Magnoliophyta: Gentianaceae to Hydroleaceae. Oxford Univ. Press, New York, NY. 505 pp. Google Scholar
Krings, A. 2001. Neotypification of Enslenia albida and a new combination in Ampelamus for Cynanchum laeve (Apocynaceae). Sida 19: 925-929. Google Scholar
Liede, S. 1997a. Subtribes and genera of the tribe Asclepiadaceae (Apocynaceae, Asclepiadoideae) – a synopsis. Taxon 46: 233-247. Google Scholar
Liede, S. 1997b. American Cynanchum (Asclepiadaceae) – a preliminary infrageneric classification. Novon 7: 172-181. Google Scholar
Liede, S., and A. Täuber. 2002. Circumscription of the genus Cynanchum (Apocynaceae – Asclepiadoideae). Systematic Botany 27: 789-800. Google Scholar
Liede, S., and U. Meve. 1997. Some clarifications, new species, and new combinations in American Cynanchinae (Asclepiadaceae). Novon 7: 38-45. Google Scholar