Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. plant material
8. [wood and wood by product]
9. wood (plant material)
10. [wood by composition or origin]
11. hardwood
12. birch (wood)

Anotations

Scope note:

Wood of the species Betula nana, a shrub or small tree native to arctic and cool temperate regions of northern Europe, northern Asia, and northern North America, in Greenland and mountains above 300 m in Scotland and at 2,200 m in the Alps.