在植物命名中,種下分類群[1](infraspecific taxon)又稱種下[2][3][4](infraspecies),是在「種」層級(種級[5])之下的一個物種分類單元。換句話說,在單一物種的範圍內,之後的等於是下一級。種下名(infraspecific name)是種級以下任何分類單元的學名。
種下分類群使用於三名法中。
參考
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