Trapa bispinosa, T. linga 水菱角 Shuǐ líng jiǎo Water caltrop  
The species are floating annual aquatic plants, growing in slow-moving water up to 5 m deep, native to warm temperate parts of Eurasia and Africa. They bear ornately shaped fruits, which in the case of T. bicornis resemble the head of a bull or the silhouette of a flying bat. Each fruit contains a single very large, starchy seed. T. natans and T. bicornis have been cultivated in China and the Indian subcontinent for the edible seeds for at least 3,000 years.
Nature- cool    FLAVOR: Sweet    CHANNEL: Large Intestine, Stomach
FUNCTIONS
1. RAW: Clear up Summer Heat and heat in the body.[1]
2. COOKED: Benefit the Qi, strengthen Spleen.[1]
INDICATIONS
1. Mental depression and thirst.[1]


References
[1] A Complete English Dictionary of Medicinal Terms in Chinese Acupuncture and Herbalism 1981- Henry Lu Chinese Foundations of Natural Health- The Academy of Oriental Heritage, Vancouver, Canada.
Images
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2. detail.tmall.com