Frankincense, or olibanum, ("Boswellia carterii") and myrrh ("Commiphora abyssinica") have long been valued for the aromatic resins they produce. These resins are extracted via tapping, or cutting of the bark to make it release sap. The liquid sap hardens and is gathered, sold as is or further processed and mixed with spices, seeds, and roots to make various forms of incense. Both species are native to parts of Northeast Africa (Somalia, frankincense; Somalia and Ethiopia, myrrh) and Arabia (Oman and Yemen, frankincense), but their distribution and use have been extended beyond these regions to India and China. The best frankincense is grown in Oman and the incense is widely used in worship in India. The ancient Egyptians prized frankincense for the resin they used to make the characteristic dark eyeliner and myrrh as an embalming agent for deceased pharaohs. At that time, myrrh was worth more than gold. In modern times resins from these trees are used in Chinese herbal medicine and Indian Ayurvedic medicine to treat several ailments. Pills containing small doses of frankincense and other ingredients are valued in oriental medicine for promoting blood flow and the movement of the "qi" (‘life force’ or ‘spiritual energy’). and myrrh is similarly claimed to promote blood flow, stimulate the stomach and digestion, and to be useful in treating diabetes, menopause, uterine tumors, amenorrhoea, and dysmenorrhea. Both frankincense (containing triterpene acids) and myrrh are used to relieve pain and inflammation as in arthritis and asthma.