Begonia tinctoria L.B. Sm. & B.G. Schub. Begonia tinctoria L.B. Sm. & B.G. Schub., Contr. Gray Herb. 127: 29. 1939 sec. Burt-Utley 2014=Begonia tacana Ziesenh., Begonian 38(4): 83-84, f. 10-17. 1971 syn. sec. Burt-Utley 2014