It ranges from Ethiopia, Kenya, and Tanzania in the east, west through Uganda, Burundi, Rwanda, and Malawi, into the Democratic Republic of the Congo and Zambia. It is considered one of the most diverse species in Africa. Its distinctive characteristics include a fused spathe with sparse hairs, blue flowers with bilocular ovaries, and nearly square fruits containing four seeds that are roughly spherical. It currently contains five subspecies, and at times has been split into five separate species that mostly correspond to the currently recognised subspecies. However, some of the subspecies may be functioning as species, and further study is needed to resolve the question of species limits in this group.[7]
^de Wildeman, Emile Auguste Joseph (1931). Plantae Bequaertianae, Études sur les Récoltes Botaniques du Dr. J. Bequaert, Chargé de Missions au Congo Belge (1913–1915). Vol. 5. Gand: J. Lechevalier. p. 173.
^Schumann, Karl Moritz (1895). "Commelinaceae". In Engler, Adolf (ed.). Die Pflanzenwelt Ost-Afrikas und der Nachbargebiete (in German). Vol. C. Berlin: D. Reimer. pp. 134–137.
^Lebrun, Jean; Taton, A.; Toussaint, L. (1948). Exploration du Parc National de la Kagera: Mission J. Lebrun (1937-1938). Vol. 1. Bruxelles: Institut des parcs nationaux du Congo belge. p. 28. OCLC496042608.