|The roble beech (Nothofagus obliqua) from South America|
Nothofagus, also known as the southern beeches, is a genus of 36 species of trees and shrubs native to the temperate oceanic to tropical Southern Hemisphere in southern South America (Chile, Argentina) and Australasia (east and southeast Australia, New Zealand, New Guinea and New Caledonia). Fossils have recently been found in Antarctica.
In the past, they were included in the family Fagaceae, but genetic tests by the Angiosperm Phylogeny Group revealed them to be genetically distinct, and they are now included in a family their own, the Nothofagaceae.
Many individual trees are extremely old, and at one time it was believed that some populations could not reproduce in present-day conditions at the location where they were growing, except by suckering (clonal reproduction), being remnant forest from a cooler time. It has since been shown that sexual reproduction may occur, but distribution in cool, isolated high-altitude environments at temperate and tropical latitudes is consistent with the theory that the genus was more prolific in a cooler age.
The genus is classified in the following sections:
- Sect. Brassospora (type Nothofagus brassi)
- Nothofagus aequilateralis (New Caledonia)
- Nothofagus balansae (New Caledonia)
- Nothofagus baumanniae (New Caledonia)
- Nothofagus brassii (New Guinea)
- Nothofagus carrii (New Guinea)
- Nothofagus codonandra (New Caledonia)
- Nothofagus crenata (New Guinea)
- Nothofagus discoidea (New Caledonia)
- Nothofagus flaviramea (New Guinea)
- Nothofagus grandis (New Guinea)
- Nothofagus nuda (New Guinea)
- Nothofagus perryi (New Guinea)
- Nothofagus pseudoresinosa (New Guinea)
- Nothofagus pullei (New Guinea)
- Nothofagus resinosa (New Guinea)
- Nothofagus rubra (New Guinea)
- Nothofagus starkenborghii (New Guinea)
- Nothofagus stylosa (New Guinea)
- Nothofagus womersleyi (New Guinea)
- Sect. Fuscospora (type Nothofagus fusca)
- Nothofagus alessandri (Central Chile)
- Nothofagus fusca (New Zealand)
- Nothofagus gunnii (Australia: Tasmania)
- Nothofagus solandri (New Zealand)
- Nothofagus truncata (New Zealand)
- Sect. Lophozonia (type Nothofagus menziesii)
- Nothofagus alpina (=N. procera) (Central Chile/Argentina)
- Nothofagus cunninghamii (Australia: Victoria, Tasmania)
- Nothofagus glauca (Central Chile)
- Nothofagus macrocarpa (Central Chile, prov. Argentina)
- Nothofagus menziesii (New Zealand)
- Nothofagus moorei (Australia: New South Wales, Queensland)
- Nothofagus obliqua (Chile/Argentina)
- Sect. Nothofagus (type Nothofagus antarctica)
- Nothofagus antarctica (Southern Argentina and Chile)
- Nothofagus betuloides (Southern Argentina and Chile)
- Nothofagus dombeyi (Central Chile and Andean Patagonia-Argentina)
- Nothofagus nitida (Southern Chile and probably Argentina)
- Nothofagus pumilio (Argentina/Chile)
The pattern of distribution around the southern Pacific Rim suggests the dissemination of the genus dates to the time when Antarctica, Australia and South America were connected, a common land-mass or supercontinent referred to as Gondwana.
Beech mast 
Every four to six years or so Nothofagus produces a heavier crop of seeds and is known as the beech mast. In New Zealand the beech mast causes an increase in the population of introduced mammals such as mice, rats and stoats. When the rodent population collapses, the stoats begin to prey on native bird species, many of which are threatened with extinction.
See also 
- Cyttaria, genus of ascomycete fungi found on or associated with Nothofagus
- Li, H. M.; Zhou, Z. K. (2007). "Fossil nothofagaceous leaves from the Eocene of western Antarctica and their bearing on the origin, dispersal and systematics of Nothofagus". Science in China 50 (10): 1525–1535.
- Dawson, J. W. (1966). "Observations on Nothofagus in New Caledonia". Tuatara 14 (1).
- Nothofagus website (in French)
- H.M. Li and Z.K. Zhou (2007) Fossil nothofagaceous leaves from the Eocene of western Antarctica and their bearing on the origin, dispersal and systematics of Nothofagus. Science in China. 50(10): 1525-1535.
- Native Forest Network (2003) Gondwana Forest Sanctuary
- C. Michael Hogan (2008) Chilean Wine Palm: Jubaea chilensis, GlobalTwitcher.com, ed. Nicklas Stromberg
- "Beech forest: Native plants". Department of Conservation. Retrieved 26 August 2012.
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