Browsing items filed under: Requires Shelter × Free Draining/Volcanic × Heavy Clay Loam × Moist/damp × Blechnum discolour Crown fern. Piupiu. Found throughout NZ usually in drier forests Cyathea medullaris Mamaku, black ponga Tallest of the tree ferns Libertia grandiflora NZ Iris- found lowland and forests in North Island and Nelson area of South Island. Tufted plant with narrow flax-like leaves. Delicate white flowers followed by large berries. Rhopalostylis baueri var cheesemanii Kermadec nikau The Kermadec nikau has longer fronds, larger flower heads and darker seeds than the mainland nikau.