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This taxon is a hybrid between N. alpina and N. obliqua. It has leaves with 10–14 pairs of secondary veins and an oblique or truncate base; the cupule scales are 1–4 mm long with sparse glands. In comparison, N. alpina has leaves with 12–18 pairs of secondary veins and a cuneate or truncate base, cupule scales 3–8 mm long with numerous glands; N. obliqua has leaves with 7–12 pairs of secondary veins and an oblique base; cupule scales 1–2 mm long with no glands. Grant & Clement 2004. Distribution CHILE: in any area where the ranges of the two parent species overlap. Also in cultivation. USDA Hardiness Zone 8. Cross-reference S346.
Nothofagus ×dodecaphleps is apparently rare in cultivation, but it could occur from arboretum- or even wild-collected seed and should be looked for in seedling batches. A recognised specimen has grown at Tregrehan since 1994 and is currently about 8 m tall (T. Hudson, pers. comm. 2007).