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椐 is a phono-semantic compound designating a woody plant or small tree, sometimes identified in historical texts as a birch or similar deciduous species. The left side is the semantic component 木 ('wood/tree'), indicating a plant; the right side is the phonetic component 居, giving the reading jū. Like many specialized botanical characters in classical literature, its exact biological identity has become obscure over time, and the character now appears mainly in historical or literary contexts rather than in modern arboriculture or everyday botany.
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