water caltrop (trapa natans), floating aquatic plant with edible nuts

edible nuts green tracheophytes angiosperms eudicots rosids myrtales lythraceae trapoideae voigt trapa rossica bicornis aquatic plants water chestnut singhara nut buffalo bat devil pod ling natans fresh nature plant leaf float zygophyllaceae tribulus terrestris seed small caltrops leaves flora organic delicious