為水生蕨類植物,植株飄浮水面,葉子三片輪生於莖節上,2片浮出水面,為卵狀長橢圓形,表面密生許多小突起,1片變態葉垂於水中,形態像鬚根,孢子囊著生於葉背。
栽培於水盆可供觀賞用,生長速度快速,每2至3天就增加一倍的族群量,對生態系統造成嚴重影響,被視為是水體優養化的生態殺手。
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