Goldblatt, P. ., & Manning, J. C. . (2015). Two new subspecies of Dietes (Iridaceae: Iridoideae), Dietes iridioides subsp. angolensis from Angola and Dietes bicolor subsp. armeniaca from eastern South Africa, with notes and range extensions for Dietes butcheriana and Dietes iridioides. African Biodiversity & Conservation, 45(1). https://mail.abcjournal.org/index.php/abc/article/view/161