Medicinal source:

Valkenburg, J.L.C.H. van & Bunyapraphatsara, N. (eds.) (1999). Medicinal and Poisonous Plants 2 (Plants Resources of South-East Asia 12 (2)). Backhuys, Leiden. [MPNS is grateful to Uwe Schippmann (MAPROW) for providing the data from this reference.]