Location, location, location

The leaves of every tree species are positioned at precise locations along the twigs. If they are opposite, two leaves face each other; if they are alternate, they are staggered; and if they are verticillate, they are arranged in whorls. Similarly, our arms are positioned opposite each another; the teeth of a zipper alternate; and the spokes of a wheel are verticillate (they’re all attached to the axle at the same height).

This difference in construction provides an additional clue to a tree’s identity. However, since trees regularly lose their leaves, it’s important to be careful and observe several locations in order to avoid jumping to conclusions. Can you identify the various leaf arrangements in this photo?