This member of the Araliaceae family was described by Carl Peter Thunberg in 1780. It is found in the mid- and southern Africa, where it grows on hillsides and rocky outcrops. Well drained soil, some water and lots of sun. The corky stem will grow to 60 centimetres in diameter and reach for 17 meters. The flowers are greenish-yellow. The genera is named after Pierre Cusson, 1727-1783, a French physician, botanist and mathematician. The species means ' spike-like, or disposed on a spike.

