為多年生草本蕨類植物,根狀莖長於泥地中,節上着生細根及葉子,葉柄長,頂生小葉4片,十字對生,質薄,全緣,空間寬敞時,葉子平貼水面,空間擁擠時,葉子挺出水面。孢子囊長於葉柄基部,為斜卵形或圓形。
生長於沼澤、水田等濕地,現今野外族群量較少,常被栽種為水生綠化植物。
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