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| Goldblatt, Peter and Manning, John 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. Bothalia (Online), 2015, vol.45, no.1, p.1-6. ISSN 0006-8241
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