nl, oost-zuid-holland, ranunculus repens, agrostis stolonifera, poa trivialis, trifolium repens, lolium perenne, glyceria fluitans, holcus lanatus, glyceria maxima, persicaria amphibia, phalaris arundinacea, stellaria media, alopecurus geniculatus, alopecurus pratensis, elymus repens, poa annua, ranunculus acris, rumex acetosa, spirodela polyrhiza, persicaria hydropiper, myosotis scorpioides, rorippa amphibia, ranunculus sceleratus, glechoma hederacea, lemna trisulca, cerastium holosteoides, phleum pratense, cardamine pratensis, sparganium erectum, dactylis glomerata, equisetum fluviatile, elodea nuttallii, poa pratensis, juncus articulatus, galium palustre, bellis perennis, capsella bursa-pastoris, polygonum aviculare, cirsium arvense, bromus hordeaceus, sagittaria sagittifolia, butomus umbellatus, ranunculus flammula, argentina anserina, oenanthe aquatica, eleocharis palustris, hydrocharis morsus-ranae, juncus effusus, stellaria alsine, lolium pratense, ceratophyllum demersum