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. willow (wood)

Anotations

Scope note:

Wood of the species Salix nigra, native to eastern North America. It varies in color from almost white to brownish-yellow, and is important in the manufacture of artificial limbs. The young, long, pliable shoots are used for wicker baskets and furniture.