Type: Hieronymus 566 in part (holotype GOET, n v), Sierra Chica, Quebrada de Colanchanga, cerca del cerro Pan de Azucar, Cordoba, Argentina, Dec 1875. Material under this number in Cordoba has somewhat different locality data. Cf A. T. Hunziker, Trab. Mus. Bot. Univ. Nac. Cordoba 2: 300. 1960. Evidently the numbers of Hieronymus do not represent individual collections, but rather a group of collections that he considered all one species.
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