Figure.
A. Azolla pinnata, B. Nelumbo nucifera, C. Nymphoides cristata, D. N. indica, E. Pistia stratiotes, F. Potamogeton nodosus, G. Ricciocarpus natans, H. R. natans (enlarged), I. Spirodela polyrrhiza, J. S. polyrrhiza (enlarged)
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