The Book of Songs mentions a plant called cháng-chǔ, whose modern identity is uncertain.
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Not used alone in modern Chinese. It survives mainly in the classical plant name 苌楚 from the Book of Songs and as a rare surname, most famously the Zhou-dynasty figure 苌弘, whose blood was said to turn to jade.
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Literary and onomastic only — seen in classical poetry and old names, not in everyday speech.
