Boswellia sacra (frankincense) (olibanum-tree), Sultanate of Oman

boswellia sacra frankincense olibanum resin harvesting oman arabian peninsula traditional practice nature agriculture tree sap extraction herbal remedies natural products rural landscape clear skies worker technique cultural heritage desert essential oils incense perfumery aromatic plants sustainability biodiversity resources botanical local economy care ancient traditions environmental conservation arid climate coastal views