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The only living genus of the order Equisetales, class Equisetopsida (Sphenopsida), division Equisetophyta (Sphenophyta); distantly related to ferns. It grows in moist places. The hollow, jointed, ridged stems contain SILICATES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020829 · MeSH 2026。
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