What is referred to by 'arboreal symbol of strength'?

Based on the clue 'arbo is tree this tree material is ligno', what is the answer? Based on the clue 'arbor day in california march 7', what is the answer? Based on the clue 'arbor day likely helped it become the tree planter...', what is the answer? Based on the clue 'arboreal chart of your genealogy', what is the answer? What is referred to by 'arborio medium grain brown'? Based on the clue 'arcesilaus founds the second academy of this city', what is the answer? What is associated with: archaeological digs in 1996 indicate that buddha was born in this country about 145 miles sw o… Based on the clue 'archaeological digs showed that pompeii stabiae t...', what is the answer?