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2011-07-27 Vienna XXII. district - Danube National Park (Lobau Hausgraben - bayou 153 msm Quadrant 7865/1). German name: Klein-Springkraut This of course is not an aquatic plant: it grew in Hausgraben ditch which remained dry for most of the year 2011, until finally water levels of Danube rose - and again some water was drained into Hausgraben stream. Those plants here began withering away soon after the ditch had been flooded - here you see them still looking fresh and vital.