The incense comes from the resin of the boswellia, a stout, gnarly-branched tree that mostly grows in the Horn of Africa.
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Boswellia is a plant also known for its anti-inflammatory properties.
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Of the trees that haven't been destroyed, he said 85% are "heavily infested by one or more long-horned beetles" that bore into the wood of adult boswellia and eat them from the inside.