Great water plantain (mad-dog weed, marsh drain)
Alisma plantago-aquatica
Water plantain, mad-dog weed, marsh drain - Alisma plantago-aquatica

Water- or marshplants; officinal (medicinal) plant;
VI-IX, Z4-8, 70 cm;
white umbel panicles.

Water plantain, alisma, great water plantain, mad-dog weed, marsh drain.