Curated OER
Life Cycle of Trees
Turn your students into young tree-tectives with this fun science investigation into the life of trees. To begin, a class volunteer gets dressed up in a tree costume as the different parts of trees are introduced. Then, the class...
Oregon State University
Oregon State University: Dichotomous Key
An excellent starting point. Get a good description of what the dichotomous key for tree identification is and then directions for using it to identify trees.