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