FRQ
   21 SALVINIA NATANS (L.) AL 1-6
   20 LEMNA MINOR L.          1-6
   17 SALVINIA NATANS (L.) AL 5-6
   13 LEMNA TRISULCA L.       1-6
   11 SPIRODELA POLYRRHIZA (L 1-6

    7 CERATOPHYLLUM DEMERSUM  1-6
    3 SPIRODELA POLYRRHIZA (L 3-6
    3 HOTTONIA PALUSTRIS L.   1-6
    3 UTRICULARIA VULGARIS L. 1-6
    2 AZOLLA FILICULOIDES LAM 1-6

    2 LEMNA MINOR L.          3-6
    2 HIPPURIS VULGARIS L.    1-6
    2 CERATOPHYLLUM SUBMERSUM 1-6
    1 POTAMOGETON LUCENS L.   1-6
    1 LEMNA TRISULCA L.       4-6

    1 HYDROCHARIS MORSUS-RANA 1-6
    1 NUPHAR LUTEUM SM.       1-6
    1 UTRICULARIA MAJOR SCHMI 1-6