The birth of the Dragon Wood should belong to the Quaternary glacial period before the age of this wood is sunk when the water, Baoding Laiyuan, Zhangjiakou Weixian, Shanxi and other places have. Generally grow in the shade of the mountain, and is the upper half of the mountain, near the top of the position.
And the tree is a growth, it grows in clusters, so it's hard to see the long thick and straight wood, the general can only do strings, long and thin can do walking stick.
In addition, the edge of the leaf blade jagged; branch new skin longitudinal cracking if the walnut tree old trunk skin color, trunk old skin smooth if the French sycamore trunk skin color; branches and trunk within the wood into a sheet or filament, toughness is very strong, folded and uninterrupted, like cattle tendon general wood hard, almost can not see the annual cycle, the branch is extremely difficult to break.