Yes, the University has some beautiful buildings. It also has its share of natural wonders, which you can check out May 3, when Ann Rhoads, Tim Block and Anna Anïsko (senior scientist of the Pennsylvania Flora Project, director of botany and botanical illustrator at the Morris Arboretum, respectively) lead a walk and talk around the campus, pointing out some of the University’s botanical treasures. Rhoads, Block and Anïsko are celebrating the publication (by Penn Press) of their definitive guide, “Trees of Pennsylvania,” an illustrated volume containing information on the state’s more than 200 tree species, both native and naturalized. So bring your walking shoes, and get ready to appreciate the campus in an entirely new way.

—Morris Arboretum botanists Ann Rhoads, Tim Block and Anna Anïsko lead a tree walk and talk, sponsored by Penn Press, UC Green and the Penn Bookstore. 5:30 p.m. at the Bookstore, 3601 Walnut St. Info: 215-898-7595 or www.upenn.edu/bookstore.