An arboretum's a collection of trees. Related collections include a fruticetum (from the Latin frutex, meaning shrub), and a viticetum, a collection of vines. More commonly today, an arboretum's a botanical garden containing living collections of woody plants intended at least partly for scientific study. An arboretum specialising in growing conifers's known as a pinetum. Invention Egyptian Pharaohs planted exotic trees and cared for them; they brought ebony wood from the Sudan, pine and cedar… (More on Pinetum)