Northern Catalpa, Catalpa speciosa Acc. # 2776-A*1 (photo: Robert Mayer)
The Arboretum’s plant collection holds catalpa species from North America and Asia, all of which bloom in early summer. Northern catalpa (also known as western or hardy catalpa; Catalpa speciosa
), one of the native species, was the subject of a cultivation craze in the late nineteenth century.
Arnoldia 46/2, 1986 [pdf]