Yungas forest is a semi-evergreen subtropical montane forest type to be found on the southern slopes of the Andes. In Argentina, the Yungas extend along discontinuous mountain ranges between 22° to 29° south. Between 1200 – 2500m asl the forest is dominated by Andean Alder (Alnus acuminata) and Mountain Pine (Podocarpus parlatorei) and/or Queñoa (P. australis); at lower elevations these species form a mosaic with other trees, especially Lauraceae and Myrtaceae. The northern premontane lowland forest type is the most species-rich as well as the most endangered because of clear-felling, with deforestation running at 2·3% a year. In the northern sector of the Argentine Yungas, near Orán, 13,500 Ha have been cleared to grow citrus, mainly grapefruit.
Argentina shares with Chile the region known as Patagonia. On the eastern slopes of the Andes where there is sufficient rainfall may be found a continuation of the Valdivian rainforests (see under Chile). Gondwanan species, including three species of Nothofagus, can also be found further south, below the snowline on the higher slopes of Los Glaciares National Park.