Eleocharis tuberosa.
Botanical name:
Classic texts: Sturtevant 1919.
Eleocharis dulcis (Burm. f.) Trin. ex Hensch.
Engl.: Chinese water chestnut.
Bot. syn.: Eleocharis dulcis (Burman f.) Trin. ex Henschel, Eleocharis tuberosa (Roxb.) Schult.
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Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.