Boswellia sacra (Syn.: Boswellia carterii Birdw.) is a tree in the Burseraceae family. It is the primary tree in the genus Boswellia from which frankincense, a resinous dried sap, is harvested. It is native to the Arabian Peninsula (Oman, Yemen), and northeastern Africa (Somalia). Boswellia sacra is abundant in Oman and southern Yemen in arid woodland, on the steep, precariously eroding slopes in the mountains of Dhofar, but it is most prevalent in northern Somalia. This species of Boswellia is a small deciduous tree, which reaches a height of 2 to 8 m (6 ft 7 in to 26 ft 3 in), with one or more trunks. Ruxiang (Gummi olibanum), the dried gum resin of Boswellia carterii (BC), has been used in traditional Chinese medicine to alleviate pain and inflammation for thousands of years. Boswellia carterii (BC) extract has significant anti-arthritic and anti-inflammation effects and suggest that these effects may be mediated via the suppression of pro-inflammatory cytokines.