It is thought that the area of the populations of Gymnocalycium mihanovichii (Fric ex Gurke) Britton & Rose is vast. From the Provinces of Chaco, Formosa and part of Santiago del Estero (Kiesling 2005, 114), in the Argentinian Chaco Austral, it continues to the north after crossing the Rio Pilcomayo, to occupy a wide central band in the Depto Boquerón, and an area to the north west that extends into the Depto Alto Paraguay (where it meets with the populations of Gymnocalycium stenopleurum F. Ritter), in the Paraguayan Chaco Boreal. The extention of the occupied area might suggest G. mihanovichii  is the dominant species of the genus Gymnocalycium in the central part of the Chaco Biome. In reality this hypothesis should be verified with surveys, especially in the southern part of the distribution. In fact, most of the surveys known are in Paraguay (see Ralph Martin’s field numbers serch), where the populations are widespread but the region is increasingly subject to the soils conversion to agricultural land (Charles 2009, 249). Even Charles (ibid.) reports the Chaco Austral in the distribution of the taxon, and mentions surveys in the province of Formosa in Argentina. Here, the surveys of the taxon really are few compared to to the vastness of the distribution area, and they are all concentrated in a vertical strip of land (50 x 175 km) between Castelli (Chaco) to the south, and the Pozo del Tigre - Estanislao del Campo (Formosa) line to the north (HU 1575, MAW 9/7, P 242, S 100, VOS 5-89, WP 97-272/585, data gathered from Ralph Martin’s field numbers serch). It is worth noting that on the same vertical axis, about 125 km north, the populations of the taxon begin in the Paraguayan land. Among our next objectives is the verification of the extension of G. mihanovichii between the provinces of Formosa, Chaco and Santiago del Estero in the Argentinian Chaco. (Quoted from: Anceschi & Magli 2013b, 61)