Arisarum vulgare.

Botanical name: 

Arisarum vulgare Targ. Aroideae.

Mediterranean regions. In north Africa, the roots are much used in seasons of scarcity. The root, which is not as large as our ordinary walnut, contains an acid juice, which makes it quite uneatable in the natural state. This is, however, removed by repeated washings and the residue is innoxious and nutritive.

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