Commiphora is the most species-rich genus in the family Burseraceae — the frankincense and myrrh family — within the order Sapindales. It encompasses approximately 190 species of shrubs and trees distributed across the sub-tropical and tropical regions of Africa, the western Indian Ocean islands, the Arabian Peninsula, India, and South America.
The genus is strongly drought-tolerant, thriving in xerophytic scrub, seasonally dry tropical forests, and open woodlands. Many species have succulent stems, particularly those native to the driest environments. Leaves are pinnately compound (rarely unifoliolate), and many species are armed with spines. A distinctive feature of the genus is the bark, which often peels away in thin sheets to reveal colorful inner bark that is sometimes capable of photosynthesis. Flowers are typically dioecious and the fruits are drupes.
When stems are wounded, many Commiphora species exude fragrant aromatic resins. These dried resins, collectively known as myrrh, have been used for millennia as fragrance and medicine. The genus is perhaps best known for this resin — myrrh appears frequently in historical texts of cultural significance, including the Bible. Commiphora gileadensis, the source of the Balsam of Mecca, is among the most historically prominent species. Products from the genus have also served as timber, building material, and natural fencing across its range.
Commiphora is regarded as a model genus for studying plant evolution in the drier regions of the Old World tropics, with diversity concentrated especially in eastern continental Africa and Madagascar. Its sister genus, Bursera, plays an analogous role in the New World seasonally dry tropical forests. DNA sequence data has confirmed the monophyly of Commiphora, though earlier classifications of the genus into sections have not been supported as reflecting true monophyletic interspecific relationships.
Etymology
The genus name Commiphora derives from the Greek words kommi (gum) and phoros (bearing), a reference to the resin-producing habit for which many species in this genus are renowned.
Distribution
Commiphora is distributed across sub-tropical and tropical Africa, the western Indian Ocean islands (including Madagascar), the Arabian Peninsula, India, and South America. Diversity is particularly concentrated in eastern continental Africa and Madagascar, where the genus is a defining element of seasonally dry and xerophytic vegetation.
Ecology
Commiphora inhabits xerophytic scrub, seasonally dry tropical forests, and open woodlands across its range. The genus is drought-tolerant, and many species have succulent stems as an adaptation to arid conditions. It has been highlighted as a model genus for studying plant evolution and diversification in the drier regions of the Old World tropics, particularly in Africa and Madagascar.
Cultural Uses
The aromatic dried resins of several Commiphora species — collectively called myrrh — have been traded and used for thousands of years as incense, perfume, and medicine. Myrrh is frequently cited in the Bible and other ancient texts. Commiphora gileadensis is the source of the Balsam of Mecca. Beyond resins, the genus has also provided timber, building material, and living or cut fencing across its African and Arabian range. A ~1,000-year-old seed recovered from an archaeological site in the Judean Desert — tentatively linked to a biblically referenced medicinal plant — has been germinated and is being studied at the Louis Borick Natural Medicine Research Center.
Taxonomy Notes
Molecular studies using DNA sequence data have confirmed that Commiphora is monophyletic. However, the same data showed that earlier classifications dividing the genus into sections do not reflect monophyletic interspecific groupings, and those sectional arrangements have been abandoned. Approximately 181 species are currently accepted. Commiphora belongs to the family Burseraceae and is the sister genus to the New World genus Bursera.
