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