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M. Martínez-Azorín and M. B. Crespo, “Ethesia tanquana (Ornithogaloideae, Hyacinthaceae), a new species from the Tanqua Karoo (South Africa), with notes on E. haalenbergensis”, anjardbotmadr, vol. 69, no. 2, pp. 201–208, Dec. 2012.