FRQ
   50 CERATOPHYLLUM DEMERSUM  1-6
   49 NUPHAR LUTEUM SM.       1-6
   43 SPARGANIUM SIMPLEX HUDS 1-6
   38 MYRIOPHYLLUM SPICATUM L 1-6
   32 POTAMOGETON PECTINATUS  1-6
   31 HELODEA CANADENSIS RICH 1-6
   28 RANUNCULUS CIRCINATUS S 1-6
   25 MYRIOPHYLLUM VERTICILLA 1-6
   22 POTAMOGETON LUCENS L.   1-6
   22 NUPHAR LUTEUM SM.       4-6
   20 POTAMOGETON NATANS L.   1-6
   18 SAGITTARIA SAGITTIFOLIA 1-6

   17 POTAMOGETON CRISPUS L.  1-6
   17 RANUNCULUS CIRCINATUS S 3-6
   16 LEMNA MINOR L.          1-6
   15 CERATOPHYLLUM DEMERSUM  4-6
   13 POTAMOGETON MUCRONATUS  1-5
   12 POTAMOGETON PERFOLIATUS 1-6
   12 HOTTONIA PALUSTRIS L.   1-6
   12 NYMPHAEA ALBA L.        1-6
   11 SPARGANIUM SIMPLEX HUDS 3-6
   11 POTAMOGETON PUSILLUS L. 1-6
    9 POTAMOGETON MUCRONATUS  3-5
    9 HYDROCHARIS MORSUS-RANA 1-6

    6 POTAMOGETON TRICHOIDES  1-6
    6 POTAMOGETON DENSUS L.   1-6
    4 POTAMOGETON TRICHOIDES  4-6
    4 POTAMOGETON NATANS L.   4-6
    4 SPIRODELA POLYRRHIZA (L 1-6
    4 LEMNA TRISULCA L.       1-6
    4 LUDWIGIA PALUSTRIS (L.) 1-6
    4 MYRIOPHYLLUM SPICATUM L 4-6
    3 ZANNICHELLIA PALUSTRIS  1-6
    3 POTAMOGETON FLUITANS RO 1-6
    3 HELODEA CANADENSIS RICH 4-6
    3 SCIRPUS LACUSTRIS L.    1-6

    3 CALLITRICHE OBTUSANGULA 1-6
    2 POTAMOGETON PECTINATUS  4-6
    2 POTAMOGETON LUCENS L.   4-6
    2 SAGITTARIA SAGITTIFOLIA 3-6
    2 RANUNCULUS TRICHOPHYLLU 1-6
    2 HIPPURIS VULGARIS L.    1-6
    1 POTAMOGETON PUSILLUS L. 3-6
    1 POTAMOGETON PERFOLIATUS 3-6
    1 POTAMOGETON OBTUSIFOLIU 1-6
    1 HOTTONIA PALUSTRIS L.   3-6
    1 LUDWIGIA PALUSTRIS (L.) 4-6
    1 NYMPHAEA ALBA L.        5-6