nl, oost-zuid-holland, poa trivialis, lolium perenne, agrostis stolonifera, ranunculus repens, glechoma hederacea, elymus repens, phalaris arundinacea, poa annua, stellaria media, polygonum aviculare, trifolium repens, dactylis glomerata, holcus lanatus, spirodela polyrhiza, glyceria maxima, glyceria fluitans, lemna trisulca, urtica dioica, persicaria amphibia, rumex acetosa, elodea nuttallii, ranunculus acris, ceratophyllum demersum, phragmites australis, butomus umbellatus, capsella bursa-pastoris, plantago major, cardamine pratensis, sparganium erectum, cirsium arvense, alopecurus pratensis, cerastium holosteoides, bellis perennis, rumex obtusifolius, anthriscus sylvestris, ranunculus sceleratus, lemna gibba, symphytum officinale, alopecurus geniculatus, heracleum sphondylium, stratiotes aloides, hydrocharis morsus-ranae, epilobium hirsutum, matricaria discoidea, lemna minor, sagittaria sagittifolia, phleum pratense, festuca rubra, valeriana officinalis, galium aparine