Noun
overstory (plural overstories)
The upper portion of a community of plants, above the understory.
Just as challenging in its own way is “Orfeo” by Richard Powers, who wrote “The Overstory.” Source: Internet
Zooming ahead to a current bestseller, consider Mac-genius Richard Powers’ “Overstory” which explores the secret life of trees and the humans who learn to love them. Source: Internet