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Mesona is a genus in the mint family (Lamiaceae).
Exemplar species in this genus are the Mesona procumbens Hemsley and the Mesona Chinensis, generically called xiancao (仙草) in Mandarin Chinese, sian-chháu in Taiwanese, and leung fan (涼粉) in Cantonese. It is said to be a diuretic, used in Taiwan as a hot, viscous drink, or curded and served over ice as a type of grass jelly .
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