boreal forest
From Glossary of Meteorology
The forested region that adjoins the tundra along the arctic tree line.
It has two main divisions: its northern portion is a belt of taiga or boreal woodland; its southern portion is a belt of true forest, mainly conifers but with some hardwoods. On its southern boundary the boreal forest passes into "mixed forest" or "parkland," prairie, or steppe, depending on the rainfall.
Hare, F. K. 1951. Compendium of Meteorology. 953, 957–958.