I.  Hedberg, Kelbessa, E., Edwards, S., Demissew, S., ? Persson, E., ??????, "Flora of Ethiopia and Eritrea, Volume 5: Gentianaceae to Cyclocheilaceae", Addis Ababa, Ethiopia: The National Herbarium, Addis Ababa, Ethiopia, and Department of Systematic Botany, Uppsala, SwedenAddis Ababa, Ethiopia: The National Herbarium, Addis Ababa, Ethiopia, and Department of Systematic Botany, Uppsala, Sweden, 2006.

M.  Tadesse, Demissew, S., Edwards, S., ? Hedberg, I., ??????, Flora of Ethiopia & Eritrea. The National Herbarium, Addis Ababa University, 2000.

S.  Edwards, Tadesse, M., Demissew, S., ? Hedberg, I., ??????, "Flora of Ethiopia and Eritrea, Volume 2 Part 1, Magnoliaceae to Flacourtiaceae", Addis Ababa, Ethiopia and Uppsala, Sweden: The National Herbarium, Addis Ababa University, 2000.