FRQ
   20 CERATOPHYLLUM DEMERSUM  1-6
   14 CERATOPHYLLUM DEMERSUM  4-6
   11 POTAMOGETON LUCENS L.   1-6
    9 NAIAS MAJOR ALL.        1-6
    8 MYRIOPHYLLUM SPICATUM L 1-6
    7 POTAMOGETON PECTINATUS  1-6
    6 RANUNCULUS CIRCINATUS S 1-6
    5 POTAMOGETON PERFOLIATUS 1-6

    4 POTAMOGETON PUSILLUS L. 1-6
    4 POTAMOGETON LUCENS L.   4-6
    4 POTAMOGETON ACUTIFOLIUS 1-6
    3 SPARGANIUM SIMPLEX HUDS 1-6
    3 POTAMOGETON TRICHOIDES  1-6
    3 NAIAS MAJOR ALL.        4-6
    3 SAGITTARIA SAGITTIFOLIA 1-6
    2 POTAMOGETON CRISPUS L.  1-6

    2 HYDROCHARIS MORSUS-RANA 1-6
    2 HELODEA CANADENSIS RICH 1-6
    2 TRAPA NATANS L.         1-6
    1 SALVINIA NATANS (L.) AL 1-6
    1 POTA PUSI SUBS PANORMIT 1-6
    1 POTAMOGETON PERFOLIATUS 3-6
    1 POTAMOGETON NATANS L.   1-6
    1 POTAMOGETON FLUITANS RO 1-6

    1 NAIAS MINOR ALL.        1-6
    1 SPIRODELA POLYRRHIZA (L 1-6
    1 BUTOMUS UMBELLATUS L.   1-6
    1 NYMPHOIDES PELTATA (GME 1-6
    1 UTRICULARIA VULGARIS L. 1-6
    1 MYRIOPHYLLUM VERTICILLA 1-6