Northeastern Asian Flora
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Wolffia arrhiza (L.) Horkel ex Wimm.  
Family: Lemnaceae
[Lemna arrhiza L., moreLenticula arrhiza (L.) Lam., Wolffia delilii Miq.]
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  • Japan Flora
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Japan Flora: Fronds ovoid-hemispherical, nearly flat above, convex beneath, more or less margined, about 0.7 mm. long, producing lateral gemmae from one end of the frond, with­out roots and nerves. 

Honshu (vicinity of Tokyo).  Cosmopolitan.

Wolffia arrhiza
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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