My grade 7 science class got to learn all about Canadian trees, most from Alberta. This summer and fall I collected leaves, branches, cones, and pictures of all the species of trees we have at our cabin by Calling Lake. I made laminated cards with a diagram, photo, and pressed leaf/branch of each species. The students circulated around the stations and uses a dichotomous key to figure out which tree they were observing. So the next time you are in the woods have them point them all out to you.
Any teachers out there who want my templates, worksheets, or power point presentation to go with the lab please email me!