Funastrum heterophyllum (Engelm. ex Torr.) Standl. in Contr. U.S. Natl. Herb. 23: 1170. 1924 sec. Sánchez-Escalante & Gilbert 2021
- ≡Sarcostemma heterophyllum Engelm. ex Torr. in Pacif. Railr. Rep. 5: 362. 1857 syn. sec. Tropicos 2013
- =Funastrum hartwegii (Vail) Schltr. in Repert. Spec. Nov. Regni Veg. 13(363/367): 285. 1914, nom. illeg. syn. sec. Fishbein & Gandhi 2018
- =Sarcostemma cynanchoides subsp. hartwegii R.W. Holm in Ann. Missouri Bot. Gard. 37: 530. 1950 syn. sec. Fishbein & Gandhi 2018