From the National Arbor Day Foundation, a Flash-based instructional game which prompts you through a series of identification keys of a handful of different trees.

You can identify most trees by studying their leaves, seeds, and fruit. This animation will help you learn to identify these characteristics and take a “step-by-step” approach to arrive at the name of your tree. Once you master these skills, it will be a breeze to identify any tree using our “What Tree is That?” Booklets or our Online Tree ID Guide.
– What Tree Is That?

via SEED magazines’s Daily Zeitgiest.