nl, oost-zuid-holland, agrostis stolonifera, glyceria maxima, spirodela polyrhiza, ranunculus repens, rorippa amphibia, glyceria fluitans, elodea nuttallii, lemna trisulca, poa trivialis, persicaria hydropiper, myosotis scorpioides, phalaris arundinacea, lolium perenne, trifolium repens, persicaria amphibia, holcus lanatus, sparganium erectum, stellaria media, alopecurus geniculatus, sagittaria sagittifolia, ranunculus sceleratus, ranunculus acris, poa annua, alopecurus pratensis, hydrocharis morsus-ranae, glechoma hederacea, elymus repens, oenanthe fistulosa, equisetum fluviatile, rumex acetosa, ceratophyllum demersum, butomus umbellatus, wolffia arrhiza, oenanthe aquatica, galium palustre, ranunculus circinatus, juncus articulatus, cardamine pratensis, eleocharis palustris, lemna gibba, nuphar lutea, phleum pratense, stellaria alsine, dactylis glomerata, ranunculus flammula, cerastium holosteoides, elodea canadensis, juncus effusus, carex acuta, polygonum aviculare