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