Bdellium is a semi-transparent oleo-gum resin extracted from Commiphora wightii plants of India, and from Commiphora africana trees growing in sub-saharan Africa. According to Pliny the best quality came from Bactria. Other named sources for the resin are India, Arabia, Media, and Babylon.

Commiphora wightii, with common names Indian bdellium-tree, gugal, guggal, guggul, gugul, or mukul myrrh tree, is a flowering plant in the family Burseraceae, which produces a fragrant resin called gugal, guggul or gugul, that is used in incense and vedic medicine. The species is native to southern Pakistan and western India. It prefers arid and semi-arid climates and is tolerant of poor soil.