The Pin Oak is native to North America and is a medium sized deciduous tree. The leaves of the Pin Oak have 5 or 7 pointed lobes. Each lobe has 5-7 bristle-tipped teeth. The sinuses (air filled spaces) are typically u-shaped and extremely deep cut. In fact, there is approximately the same amount of air filled area as actual leaf area. The acorns, borne in a shallow, thin cap, are bitter. Great tree for bonsai. Deciduous – keep outdoors.