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在植物命名中,种下分类群[1](infraspecific taxon)又称种下[2][3][4](infraspecies),是在“种”层级(种级[5])之下的一个物种分类单元。换句话说,在单一物种的范围内,之后的等于是下一级。种下名(infraspecific name)是种级以下任何分类单元的学名。
种下分类群使用于三名法中。
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