Medicinal source:

Siew, Y-Y., Zareisedehizadeh, S., Seetoh, W-G., Neo, S.Y., Tan, C-H. & Koh, H-L. (2014). Ethnobotanical Survey of Usage of Fresh Medicinal Plants in Singapore. Journal of Ethnopharmacology. 155 (3): 1450-1466.