By Michael Tortorello / The Bulletin
December 13, 2011
The holiest plant of the Christmas season may be a raggedy shrub with peeling bark that seems to grow best in a dusty backyard in Tempe, Ariz.
This is Boswellia sacra, better known as the frankincense tree. The shrub’s gum resin is one of the three biblical gifts that the wise men bestowed on....