nl, oost-zuid-holland, agrostis stolonifera, ranunculus repens, lolium perenne, poa trivialis, trifolium repens, holcus lanatus, elymus repens, glyceria fluitans, stellaria media, phalaris arundinacea, glyceria maxima, persicaria amphibia, dactylis glomerata, poa annua, elodea nuttallii, ranunculus acris, cirsium arvense, spirodela polyrhiza, alopecurus geniculatus, alopecurus pratensis, ceratophyllum demersum, lemna trisulca, sparganium erectum, cerastium holosteoides, glechoma hederacea, urtica dioica, rumex acetosa, persicaria hydropiper, phleum pratense, phragmites australis, polygonum aviculare, ranunculus sceleratus, lemna gibba, plantago major, rumex obtusifolius, myosotis scorpioides, poa pratensis, rorippa amphibia, bellis perennis, capsella bursa-pastoris, argentina anserina, cardamine pratensis, butomus umbellatus, ranunculus circinatus, rumex crispus, oenanthe fistulosa, carex hirta, juncus articulatus, eleocharis palustris, sagittaria sagittifolia