An arboretum (plural: arboreta) in a narrow sense is a collection of trees only. Related collections include a fruticetum (from the Latin frutex, meaning shrub), and a viticetum, a collection of vines. More commonly, today, an arboretum is a botanical garden containing living collections of woody plants intended at least partly for scientific study. An arboretum specializing in growing conifers is known as a pinetum. Other specialist arboreta include salicetums (willows), populetums, and quercetums (oaks).