Stock photography picture of Spiky fruits of water chestnut or water caltrop Trapa natans at Poyang Hu in China

B0H85D - Licenced Caption Spiky fruits of water chestnut or water caltrop Trapa natans at Poyang Hu in China Description Spiky fruits of water chestnut or water caltrop Trapa natans an annual aquatic on Zygosterophyllum mat at Poyang Hu in China during the winter when the lake level is much reduced The single fleshy starchy seed is edible after the fruit is boiled in water The plants have been cultivated in China for at least 3000 years where they are known as lingjiao In medieval times the fruits were scattered on the ground to pierce the hooves of enemy horses