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This paper describes the reaction of Pulegium vulgare and a number of species from the same locality upon the different flooding regimes of four consecutive years. These species mainly belong to the Lolio-Cynosuretum and the Ranunculo-Alopecuretum. The results show that the effect of a flood on the vegetation strongly depends on the month (the date of the year) during which the inundation occurs. A flood of shorter duration in late summer has a stronger impact than a longer inundation in spring and early summer.
Pulegium vulgare strongly decreased after being flooded in July and August and did not recover in the subsequent year. On account of the behaviour of the species after a summer inundation, seven groups were broadly distinguished.