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

Anotations

Scope note:

Soft, fine-grained wood of the species Liriodendron tulipifera of North America. The sapwood is usually a creamy off-white color; heartwood is pale green, often with streaks of red, purple, or black. It is cheap, easy-to-work, can take a sharp edge, and is stable, used to seal pipes and valves in organs, for siding clapboards, coffin boxes, pattern timber, and wooden ware.