Figure 1. Exceptionally large black walnut (Juglans nigra) on The Knoll, East Bank. Figure 2. Large bur oaks (Quercus macrocarpa) on the Knoll, East Bank. Figure 3. Katsura tree (Cercidiphyllum japonicum), a relatively unique tree species by the Saint Paul Student Center. Figure 4. Edible fruit (the seeds in the capsules) of American bladdernut (Staphylea trifolia), Alderman Hall, Saint Paul.