An outstanding, non-climbing but formidably armed Calamus with slender, clustered stems and large leaves with very wide segments that are glossy green above and distinctly white below. Unlike most Calamus it produces no climbing organs (flagellae, cirri) and does not usually exceed 6 m (20 ft.) tall. It is native to peninsular Burma and Thailand, where it grows in wet tropical forest. In cultivation it will be best suited to tropical climates and will make a stunning ornamental. C. arborescens has probably not been introduced to cultivation before.