Taken from: A. Bekele-Tesemma with A. Birnie and B. Tengnäs.  1993.  Useful Trees and Shrubs for Ethiopia.  Identification, Propagation and Management for Agricultural and Pastoral Communities.  Swedish International Development Authority (SIDA), Regional Soil Conservation Unit (RCSU), Nairobi, Kenya. Tech. Handbook No. 5. Part II.  pp.29-34. 474p.