Goldblatt, P. .; Manning, J. C. . 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. ABC 2015, 45 (1).