為一、二年生漂浮型草本水生植物,植株為葉狀體,葉子為歪斜橢圓形或倒卵形,上表面為扁平深綠色,下表面為深紫紅色,每片葉子長有根3至5條,長成群生長,雌雄同株,單性花,花序為佛焰苞。
分布於平地至低海拔地區,多生長於水田、池沼、溝渠、淺水面上,族群數量較青萍少,較為罕見,早期被當作家禽飼料,現今被栽植為觀賞的水生綠化植物。是世界上最小的開花植物之一,以無性繁殖為主。
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