Autor: F. Reichenbach ex Britton & Rose • ETYMOLOGY Genus honouring Hermann Auguste Jacques Gruson (1821-1895), German collector of cacti of French origin (see portrait above, public domain). • DESCRIPTION Monospecific genus of plants forming impenetrable dense clumps, with segmented stems, with tuberculate low ribs, areoles with white felt. Glochids absent on adult plants. Spines without ..

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