| trees | Woody, usually tall, perennial higher plants (angiosperms, gymnosperms, and some pterophyta) having usually a main stem and numerous branches. (12 Dec 1998) |
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| rough trees | Live trees of commercial species which do not contain a sawlog because of roughness, poor form, splits, or cracks. Includes all living trees of noncommercial species. (05 Dec 1998) |
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| decision trees | A graphic device used in decision analysis, series of decision options are represented as branches (hierarchical). (12 Dec 1998) |