Wolffia arrhiza (L.) Wimm.

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Synonyms:	Lemna arrhiza L. Wolffia michelii Schleid.
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Literature:	Daubs, E.H. (1965). A Monograph of Lemnaceae Illinois Biological Monographs 34 The University of Illinois Press, Urbana. Pages 48 - 49. (Includes a picture). Haigh, A. & Boyce, P. (2012). Araceae Flora Zambesiaca 12(1) Pages 11 - 12. (Includes a picture). Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 126.

Other sources of information about Wolffia arrhiza:

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Flora of Botswana: Wolffia arrhiza
Flora of Mozambique: Wolffia arrhiza

External websites:

African Plants: A Photo Guide (Senckenberg): Wolffia arrhiza
BHL (Biodiversity Heritage Library): Wolffia arrhiza
EOL (Encyclopedia of Life): Wolffia arrhiza
GBIF (Global Biodiversity Information Facility): Wolffia arrhiza
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iNaturalist: Wolffia arrhiza
IPNI (International Plant Names Index): Wolffia arrhiza
JSTOR Plant Science: Wolffia arrhiza
Mansfeld World Database of Agricultural and Horticultural Crops: Wolffia arrhiza
Plants of the World Online: Wolffia arrhiza
Tropicos: Wolffia arrhiza
Wikipedia: Wolffia arrhiza