MINEO, Baldassare. Rock garden plants. A color encyclopedia. Portland, Oregon: Timber Press, 1999. Dostupné online. ISBN0-88192-432-6. (anglicky)
BUSSMANN, Rainer W.; SHARON, Douglas. Medicinal plants of the Andes and the Amazon. The magic and medicinal flora of Northern Peru. [s.l.]: William L. Brown Center, 2015. Dostupné online. ISBN978-0-9960231-2-2. (anglicky)