How to Identify Pear Trees. There are over 800 species of pear trees, and many of them are quite similar. All pear trees have medium sized, oval-shaped green leaves that turn colors and drop in the fall. All pear trees have white blooms in clusters of five. Some are ornamental, while others do produce edible pears. Identifying a particular variety of pear tree comes down to thinking about where you live and carefully examining the fruit of the tree.