They can have pointed lobes or rounded lobes. The number of lobes can vary. They may have a sawtooth edge or a smooth edge. They may have one central vein with other veins leading off it. They may have several main veins which radiate from a single point at the base of the leaf.
Leaves come in virtually every shade of green - sometimes with other colors mixed in.
All of these characteristics are important and interesting to explore. Name That Tree. There is at least one thing unique about the leaves of every individual type of tree. With just a single leaf and a good tree identification book, you can identify most types of trees. Make rubbings of bark patterns by holding or taping the paper tightly against a tree and rubbing with the side of the crayon.