Trapa bispinosa, Roxb. India (Bombay and Madras Presidencies): seeds cooked and eaten. Ref. SHORTT, WATT.
Trapa natans, L. France: seeds recommended as a famine food. They may be eaten raw or roasted. They may also be dried and reduced to flour for making porridge. They lack sufficient starch and sugar for making bread. Vernacular name: Water Truffle. Ref. PARMENTIER.