PLANT SPOTLIGHT: Black Walnut (Juglans nigra) – Philadelphia Orchard Project
My Osage Orange Trees - The Martha Stewart Blog
Platanus orientalis. Sycamore. The fruit of the tree is patched. Green balls. Summer. Flowering of trees. Backdrop of sky and tree. Leaves of trees. Stock Photo | Adobe Stock
What are those yellow balls? | The Prairie Ecologist
Which Trees Produce Spiky Round Balls? Here's How to Identify Them
What kind of tree is this? It has small little green balls for fruit. In WA : r/treeidentification
Dr. Dirt: Galls cause little or no damage to host trees
Osage Orange - Eat The Weeds and other things, too
You Can Eat That: Black Walnut - Metro Parks - Central Ohio Park System
The Osage orange tree's purpose evolved as history developed