FRQ
   21 LEMNA MINOR L.          1-6
   14 POTAMOGETON PECTINATUS  1-6
   13 CALLITRICHE OBTUSANGULA 1-6
   11 SPARGANIUM SIMPLEX HUDS 1-6
   11 SPIRODELA POLYRRHIZA (L 1-6
   10 POTAMOGETON CRISPUS L.  1-6
   10 LEMNA MINOR L.          3-6
    7 MYRIOPHYLLUM SPICATUM L 1-6
    7 CERATOPHYLLUM DEMERSUM  1-6

    6 LEMNA TRISULCA L.       1-6
    6 NUPHAR LUTEUM SM.       1-6
    5 SPARGANIUM SIMPLEX HUDS 3-6
    5 POTAMOGETON PECTINATUS  4-6
    5 POTAMOGETON CRISPUS L.  2-6
    3 SPIRODELA POLYRRHIZA (L 3-6
    3 LEMNA GIBBA L.          1-6
    3 HELODEA CANADENSIS RICH 1-6
    3 RANUNCULUS CIRCINATUS S 1-6

    2 AZOLLA FILICULOIDES LAM 1-6
    2 POTAMOGETON NATANS L.   1-6
    2 RANUNCULUS CIRCINATUS S 3-6
    2 CALLITRICHE OBTUSANGULA 3-6
    1 ZANNICHELLIA PALUSTRIS  1-6
    1 SPARGANIUM RAMOSUM CURT 1-6
    1 POTAMOGETON PUSILLUS L. 1-6
    1 POTAMOGETON PERFOLIATUS 1-6
    1 POTAMOGETON DENSUS L.   1-6

    1 POTAMOGETON CRISPUS L.  3-6
    1 SAGITTARIA SAGITTIFOLIA 1-6
    1 RANUNCULUS TRICHOPHYLLU 1-6
    1 RANUNCULUS FLUITANS LAM 1-6
    1 HIPPURIS VULGARIS L.    1-6
    1 MYRIOPHYLLUM VERTICILLA 1-6