Begonia fusca Liebm. in Vidensk. Meddel. Dansk Naturhist. Foren. Kjobenhavn 1852: 7. 1852 sec. Burt-Utley 2014
- =Begonia maxima Klotzsch, Begoniac.: 39. 1855 syn. sec. The Plant List 2013
- =Magnusia fusca (Liebm.) Klotzsch in Abh. Königl. Akad. Wiss. Berlin 1854: 222–223, pl. 9B. 1855 syn. sec. Burt-Utley 2014
- =Magnusia maxima Klotzsch in Abh. Königl. Akad. Wiss. Berlin 1854: 223. 1855 syn. sec. Burt-Utley 2014
- =Begonia johnstonii Standl. ex J.R. Johnst., Cat. Plant. Guatemala: 12. 1938 syn. sec. Burt-Utley 2014