Revisión de las cactáceas argentinas, II : Pterocactus por Castellanos, A.

“…As its northern limit he recognizes the locality of Amaicha (Tucumán), and as the southern - that of San Julián (Chubut). To the Known species - only four, according to him - he adds a fifth: Pterocactus araucanus nv. sp., apparently endemic in Chubut and Neuquén. …”
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