sentences:  The area was declared a nature reserve in 1939 because of the native Queñoa De Altura ("Polylepis tarapacana") that grows on the hillsides of this region.This shrub-like tree has adapted to the high elevations and harsh climate of the Andes.At the time that the area was declared a national park, rampant harvesting of this tree was taking place to create charcoal to supply Bolivian mines.