In South Africa, Barleria was revised for Flora Capensis in 1901 (Clarke 1901) and sub sequently by Obermeyer (1933). Thereafter, some new taxa have been described and Mandy-Jane Balkwill (= M.-J. Cadman) undertook a study of the subdivision of the genus (Balkwill 1993) and while engaged in that study described some new species, including the spectacular B. greenii M.Balkwill & K.Balkwill (Balkwill et al. 1990). Florence C. Nyirenda has undertaken an appraisal of the southern African species of an informal group circum scribed by M.-J. Balkwill (Balkwill 1993) in Barleria Section Barleria (Nyirenda 2012) and in doing so, has provided an understanding of the significance of morphological variation in the B. rigida complex (Nyirenda & Balkwill 2018). Iain Darbyshire et al. (2019b) have appraised the complex for Angola and Namibia and have brought further deep insight to understanding the variation in this difficult group.