| Literature:
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Bridson, D.M. & Verdcourt, B. (2003). Rubiaceae, Part 3 Flora Zambesiaca 5(3) Page 561.
Burrows, J.E., Burrows, S.M., Lötter, M.C. & Schmidt, E. (2018). Trees and Shrubs Mozambique Publishing Print Matters (Pty), Cape Town. Page 1003. (Includes a picture).
Darbyshire, I., Timberlake, J., Osborne, J., Rokni, S., Matimele, H., Langa. C., Datizua, C., de Sousa, C., Alves, T., Massingue, A., Hadj-Hammou, J., Dhanda, S., Shah, T., Wursten, B. (2019). The endemic plants of Mozambique: diversity and conservation status Phytotaxa 136 Page 93.
Drummond, R.B. (1975). A list of trees, shrubs and woody climbers indigenous or naturalised in Rhodesia. Kirkia 10(1) Page 277.
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