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Related to Menyanthes trifoliata: Pontederia cordata, Typha angustifolia, Filipendula ulmaria, Potentilla erecta
A perennial aquatic herb that contains alkaloids, essential oil, flavonoids, glycosides and saponin; it is a gastric tonic and mildly sedative, and has been used for rheumatic complaints.
Large doses may cause vomiting and diarrhoea.
n See bogbean.