Mapoon is a shrub with a thick, woody rootstock and grows 60-90cm high. The leaves are pale green, 5-10cm long, thick and leathery in texture. It has a whitish flower.
Mapoon Bush growing on seleniferous soils are Se tolerant and accumulate very high concentrations of Se. Cattle, sheep and horses can be poisoned from eating Mapoon Bush containing excessive amounts of the trace element selenium. Poisoning has been reported in horses only and occurs in spring and early summer following a burn when new succulent shoots grow and are readily eaten.