FRQ
   25 LEMNA MINOR L.          1-6
   24 CERATOPHYLLUM DEMERSUM  1-6
   19 SPIRODELA POLYRRHIZA (L 1-6
   18 POTAMOGETON PECTINATUS  1-6
   18 MYRIOPHYLLUM SPICATUM L 1-6
   12 POTAMOGETON FLUITANS RO 1-6
    9 CERATOPHYLLUM DEMERSUM  4-6

    8 POTAMOGETON FLUITANS RO 4-6
    5 POTAMOGETON PERFOLIATUS 1-6
    5 LEMNA MINOR L.          3-6
    4 POTAMOGETON CRISPUS L.  1-6
    3 SPIRODELA POLYRRHIZA (L 3-6
    3 SAGITTARIA SAGITTIFOLIA 1-6
    3 RANUNCULUS CIRCINATUS S 1-6

    2 SPARGANIUM SIMPLEX HUDS 1-6
    2 POTAMOGETON TRICHOIDES  1-6
    2 POTAMOGETON PUSILLUS L. 1-6
    2 NUPHAR LUTEUM SM.       1-6
    2 MYRIOPHYLLUM SPICATUM L 4-6
    2 CALLITRICHE OBTUSANGULA 1-6
    1 NAIAS MAJOR ALL.        1-6

    1 LEMNA GIBBA L.          1-6
    1 VALLISNERIA SPIRALIS L. 1-6
    1 HELODEA CANADENSIS RICH 1-6
    1 BUTOMUS UMBELLATUS L.   1-6
    1 RANUNCULUS FLUITANS LAM 1-6
    1 MYRIOPHYLLUM VERTICILLA 1-6