Medicinal source:

Wiersema, J.H. & León, B. (1999). World Economic Plants: A Standard Reference (Retrieved as GRIN report on 17/03/2015 using query "Medizin = 'Alle Nutzungen'"). CRC Press, Boca Raton. [MPNS is grateful to Uwe Schippmann (MAPROW) for providing the data from this reference.]