Ayapana triplinervis
（重定向自Eupatorium ayapana）
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Ayapana triplinervis (aya-pana, water hemp) is a tropical American shrub in the Asteraceae family. This plant has long slender leaves which are often used to make a stimulating medicine. It contains Herniarin, a methoxy analog of umbelliferone, while its essential oil contains thymohydroquinone dimethyl ether.