地下莖為一種變態莖,是土表面下莖的統稱,相對於地上莖,其外形肥大且常呈水平走向;功能是作食物和營養的儲存組織、新殖株(克隆)的無性繁殖、多年化而幫助越冬耐旱。依型態可分為:根莖、塊莖、球莖、鱗莖。
地下莖與根的的功能雖然都作為養分的貯存處,但地下莖仍具莖的特徵,有芽與節的構造(馬鈴薯的節為芽眼)及不定根,甚或葉痕。
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