Alisma plantago.

Botanical name: 

Alisma plantago Linn. Alismaceae. Mad-Dog Weed. Water-Plantain.

North temperate zone and Australia. The solid part of the root contains farinaceous matter and, when deprived of its acrid properties by drying, is eaten by the Calmucks.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.