Prismatic birch

An upper canopy tree.  The leaves are cordate, exhibiting points at the end giving them a structure much like a fish's tail.  While the upper face is a brilliant green, the underside contains elements which refract light giving it a silvery sheen.   When blown by the wind the undersides resemble fish tails poking out of an emerald ocean hence their name.  They are found in the southern regions, but may be grown as an ornamental tree in the mid  latitudes.