text: butomus umbellatus, sparganium erectum, sparganium emersum, hydrocharis morsus-ranae, spirodela polyrhiza, elodea nuttallii, lemna trisulca, sagittaria sagittifolia, agrostis stolonifera, ceratophyllum demersum, equisetum fluviatile, glyceria maxima, lemna minor, potamogeton natans, potamogeton pusillus, ranunculus circinatus