X-Tree

a tree with branches forming the shape of an X

X-TREE. Quercus macrocarpa, Bur oak.
West side of the roundabout at Galvez and East Campus Drive.

An X-tree is a labeled tree for which the leaf labels are taken from a set X. X-trees serve as natural mathematical structures for studying the combinatorics of evolutionary trees.

Photo: Noah Rosenberg, April 30, 2018