From Wikipedia, the free encyclopedia.Arthropodium cirratum (rengarenga, renga lily, New Zealand rock lily, or maikaika) is a species of herbaceous perennial plant, endemic to New Zealand, where it may once have been farmed. It is used for medicine as well as food, and has symbolic importance in traditional Māori culture.The leaves are 30–60 cm (12–24 in) long and 3–10 cm (1.2–3.9 in) wide. The flower stalk often reaches one metre, and bears many white six-petalled flowers, in groups of two or three, each about 2 cm (0.8 in) across. The stamens are tricoloured - purple and white, with yellow at the curled end. The roots are 2–3 cm (0.8–1.2 in) wide. It occurs naturally north of Greymouth and Kaikoura near the sea and, as the name suggests, usually on rocks.