On the occurrence of the flat form of Lemna gibba L. in nature
Acta botanica neerlandica , Volume 33 - Issue 4 p. 469- 474
Lemna gibba vegetations which remain flat throughout the summer season have not been observed in the field. However, a flat “winterform” could be found above a hydrosoil of clay until May and above a hydrosoil of sand or peat until July/August. It has been concluded that flat Lemna vegetations in The Netherlands consist either of pure L. minor (mostly above sand), a mixture of L. minor and (temporarily) flat L. gibba, or exceptionally, (temporarily) flat L. gibba only.
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L. de Lange, A.H. Pieterse, & L.P.M.J. Wetsteyn. (1984). On the occurrence of the flat form of Lemna gibba L. in nature. Acta botanica neerlandica, 33(4), 469–474.
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