The Pencil Thuja (often referred to in commercial nursery trades as the Pencil Pine, Thuja Compacta, or Morpankhi) is a highly popular evergreen conifer belonging to the Cupressaceae (Cypress) family. It is a specific, slender cultivar of Thuja occidentalis (American Arborvitae) celebrated for its tight, columnar, and pencil-thin growth habit.