Resilience is Key by Trees Are Key published on 2019-06-06T17:10:02Z Trees Are Key Urban trees and forests face stress on a regular basis, but when disaster strikes, the stress can be extreme and damaging. When trees are resilient, cities and communities are too. Listen in to learn more about how "Resilience is Key." Species Spotlight This week's species spotlight features the Gum Bully Sideroxylon lanuginosum is also known as Gum Bumelia, Gum-Elastic, Woolybucket Bumelia. This deciduous Texas native is a medium-sized tree, typically to 40 feet tall and a trunk to 12" in diameter, with short, stout, stiff branches that form a narrow, oval crown of dark green foliage.