Alisma orientale is a flowering plant species in the genus Alisma found in Asia. Alisma orientale is sometimes treated as a variety of Alisma plantago-aquatica (Alisma plantago-aquatica var. orientale). The rhizomes of A. orientale have been used as a traditional Chinese medicine, ze xie. However, it may have serious side effects or even toxic effects such as hepatotoxicity. The rhizome of the plant is also a herb used in kampo Japanese medicine. The seed conatins cis-aconitic anhydride ethyl ester and cis-2,4,5-trihydroxycinnamic acid.