👉 Gumwood is a genus of about 20 species of flowering plants native to the western United States and Canada, including the eastern and western gum trees. These are deciduous evergreen shrubs or small trees that can grow up to 15 feet tall. They have large, glossy leaves with pointed tips, a thin stem, and typically white flowers in spring and summer. The genus includes about 20 species of trees and shrubs, which are commonly called gumwoods.