Burr Oak

These are some of my favourite leaves, especially in the fall. This morning, I went on a walk to see some of the 85 species of trees that grow in Stanley Park in Calgary. The Burr Oak (also called Bur Oak) leaf is narrower at the stem, becoming wider towards the end of the leaf.

Wikipedia: "The leaves are 7-15 cm long and 5-13 cm broad, variable in shape, with a lobed margin. Most often, the basal 60% is narrower and deeply lobed, while the apical 40% is wider and has shallow lobes or large teeth."