These are growing on the banks of the Rhine River in Düsseldorf, Germany. My wife has a programme on her mobile telephone for identifying wild plants: Flora incognita. Sometimes it takes a wrong turning but generally it can be useful, especially for a beginner. This programme stated that this plant is Schrophularia californica. I've had absolutely no experience with S. californica. Does anybody know the plant, please? Could this be this species? Thanks in advance for the help. The plant certainly has squared-off stems but I wouldn't say it is particularly winged, which would make me think of Water Figwort.