The high Andean region is also characterized by the presence of species of the genus Polylepis and the Azorella compacta .
Another cactus species , the Echinopsis atacamensis , grows in the pre-Andean area .
The high pre-Andean region is also characterized by the presence of species of the genus Polylepis and the Azorella compacta .
Another cactus species , the Echinopsis atacamensis , grows in the pre-Andean area .