Aganonerion polymorphum Pierre ex Spire (1906) Urceola polymorpha is a species of flowering plant in the dogbane family (Apocynaceae).

[1][2] This plant is a perennial herb with glabrous climbing stems of 1.6–4.0 m long.

Its flowers are umbel, with follicles that are 8–15 cm long and 5–8 mm wide.

[3] Urceola polymorpha is used medicinally and as a food, appearing for example in a traditional Vietnamese soup called canh chua.

In Vietnamese, the plant is called lá giang, literally "river leaf."