is a large genus of shrubs or small tree that are characterised by
very woody follicles. The Tasmanian native species (except H.
cylindrical leaves which are often curved upwards, and are often
quite hard. However, juvenile leaves are sometimes slightly
flattened The species are mostly separated by the form of the woody
follicle, and to a lesser extent on the size of the leaves. Species
are also reasonably well differentiated according to habitat.
few species appear to be naturalised in Tasmania.