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Boswellia trees and their areas of distribution. (a) B. sacra tree growing in the dry regions of Oman. (b) Trees of the species B. frereana prefer rocky terrains of Somalia. (c) Production of frankincense, the oleogum resin of Boswellia trees. (d) The growth regions of Boswellia spp. extend from West Africa to India. A particular biodiversity prevails at the Horn of Africa, in and near Somalia. Pictures reproduced with permission of Georg Huber [13]. Map data ©2020 Google, ORION-ME.
