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Caterpillar Tree

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A CATERPILLAR TREE WITH FOUR LEAVES. Quercus agrifolia, Coast live oak.
Cobb track.

A caterpillar tree is a tree in which all the vertices are connected to the spine of the tree (here the leftmost branch). Caterpillar trees are the most unbalanced binary rooted tree.

Photo: Alissa Severson, January 31, 2018