Monochoria vaginalis.
Botanical name:
Monochoria vaginalis Presl. Pontederiaceae.
Asia and African tropics. This species is esteemed as a medical plant in Japan, Java and on the Coromandel Coast. Its young shoots are edible.
Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.