Celtis occidentalis



The border of Crossgates Golf Course and Millersville University, Millersville PA


John Ambler


According to pabigtrees.com, this tree had a trunk circumference of 185 inches in 2018 and is the second largest Hackberry in the state. The nipple gall that often forms on lower leaf surfaces is a distinguishing characteristic of this tree and is caused by the jumping plant louse (psyllids). 


This amazing species is the only host plant for the Hackberry Emperor Butterfly, which itself is unusual because it rarely visits flowers.


[Tree photos from pabigtrees.com]