Mamaku:

The black-stemmed fern tree (Cyathea medullaris). Originally this place was Kaponga, the silver fern tree (Cyathea dealbata). The name was altered officially when the railway line was being made, in order to prevent confusion with another Kaponga, in Taranaki. But it is to be noted that the mamaku (korau) species of fern tree is not found in this Mamaku district.