GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Balm tree. Petra, Jordan. Many species of plants have been used as a source of balm - the aromatic resin used to embalm the dead. The species most widely used in the Middle East in biblical times was the balm of Gilead, or balsam tree, Balsamodendron gileadense.
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