Nothofagus pumilio, the lenga beech[1] (from the Mapuche language), is a deciduous tree or shrub in the Nothofagaceae family[2] that is native to the southern Andes range, in the temperate forests of Chile and Argentina to Tierra del Fuego, from 35° to 56° South latitude.

It is used in furniture, shingles and construction and sometimes as a substitute for American black cherry in the manufacturing of cabinets.

The leaves are dark green, elliptic toothed and 2–4 cm long, with irregularly lobed margins, and turn to yellow and reddish tones in autumn.

In its southerly range it occurs in dense stands as far south as Navarino Island.

[4] It grows in areas with low temperatures and abundant snow; therefore, in the north half of its distribution it is found only in the Andes Range and at sea level on its southernmost natural environment.