FRQ
   27 NYMPHAEA ALBA L.        1-6
   27 CERATOPHYLLUM DEMERSUM  1-6
   24 CERATOPHYLLUM DEMERSUM  4-6
   15 MYRIOPHYLLUM VERTICILLA 1-6
   13 TRAPA NATANS L.         1-6

   13 RANUNCULUS CIRCINATUS S 1-6
   13 NYMPHAEA ALBA L.        5-6
    7 NUPHAR LUTEUM SM.       1-6
    6 POTAMOGETON PECTINATUS  1-6
    3 POTAMOGETON CRISPUS L.  1-6

    3 TRAPA NATANS L.         4-6
    3 RANUNCULUS CIRCINATUS S 3-6
    1 POTAMOGETON PECTINATUS  4-6
    1 POTAMOGETON LUCENS L.   1-6
    1 NAIAS MAJOR ALL.        1-6

    1 HELODEA CANADENSIS RICH 1-6
    1 MYRIOPHYLLUM SPICATUM L 1-6