Aganonerion polymorphum

Cladus: Eukaryota
Regnum: Plantae
Divisio: Magnoliophyta
Classis: Magnoliopsida
Ordo: Gentianales
Familia: Apocynaceae
Subfamilia: Apocynoideae
Tribus: Apocyneae
Genus: Aganonerion
Species: A. polymorphum

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Aganonerion polymorphum is a species of flowering plant in the family Apocynaceae. It is native to Southeast Asia and is used medicinally and as a food, appearing for example in one variety of the Vietnamese soup called canh chua. In Vietnamese, it is called lá giang, literally "river leaf."