Flora della colonia Eritrea Parte 1, fascicolo 1-3 - Pirotta, Romualdo, 1853 -1936 (Tip. E. Voghera, 1903)

Flora of tropical Africa - Oliver, Daniel, 1830 -1916 (L. Reeve and co, 1901)

Flora of tropical Africa - Oliver, Daniel, 1830 -1916 (L. Reeve and co, 1901)

Das Pflanzenreich :regni vegetablilis conspectus - Engler, Adolf, 1844 -1930 (W. Engelmann, 1936)