A kind of vine.
The sap of the root is used for stunning fish. The roots are pounded and twisted to make the sap come out. Either the sap or the smashed root is placed in the water. The fish become stunned and are easily caught. The vine is found in secondary growth forest. Sometimes it is planted in order to get the sap easily. An old vine may be about 5 cm in diameter.
I have planted a tuwe-vine.