Amphilophium laxiflorum (DC.) L.G. Lohmann in Ann. Missouri Bot. Gard. 99: 405. 2014 sec. POWO 2019
- ≡Pithecoctenium laxiflorum DC., Prodr. 9: 195. 1845 syn. sec. Martínez & Ramos 2012
- =Bignonia cinerea DC., Biblioth. Universelle Geneve: 21. 1838 syn. sec. ???
- =Bignonia laxiflora A.DC., Prodr. 9: 173. 1845 syn. sec. ???
- =Pithecoctenium cinereum DC., Prodr. 9: 195. 1845 syn. sec. Martínez & Ramos 2012
- =Distictis cinerea (DC.) Greenm. in Proc. Amer. Acad. Arts 33: 487. 1898 syn. sec. ???
- =Distictis laxiflora (DC.) Greenm. in Proc. Amer. Acad. Arts 33: 486. 1898 syn. sec. Martínez & Ramos 2012
- =Pithecoctenium cinereum var. parviflorum Hochr. in Bull. New York Bot. Gard. 6: 287. 2010 syn. sec. Martínez & Ramos 2012