H.  Riedl and Edwards, S., ?157. Boraginaceae?, in Flora of Ethiopia and Eritrea, vol. 5, I.  Hedberg, Kelbessa, E., Edwards, S., Demisew, S., and Persson, E., Eds. Addis Ababa and Uppsala: The National Herbarium, Addis Ababa University and Department of Systematic Botany, Uppsala University, 2006, pp. 64 - 102.