Leaf Node
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LEAF NODE. Catalpa bignonioides, Southern catalpa.
Mayfield Avenue near Campus Drive.
Represented as a graphical structure, the mathematical trees of phylogenetics possess nodes, often represented by circles, and edges that connect the nodes. Trees have two types of nodes: internal nodes at which two or more edges intersect, and nodes that are connected only to a single edge—or leaf nodes. At a terminal branch of this catalpa, a large stone node "denotes" a leaf.
Photo: Noah Rosenberg, May 18, 2020