Type: INDONESIA. Sulawesi, Central Sulawesi, Luwuk Banggai District, Hanga-hanga waterfall, 4 June 2016. Deden Girmansyah Deden 2470 (holotype BO!; isotype CEB!, E!)1
1.Ardi, W.H., Girmansyah, D., Zulfadli & Thomas, D.C. 2021: Begonia willemii, a new species of Begonia from Sulawesi, Indonesia. – Taiwania 66(3): 374-377