ex Kunth Arthropodium cirratum (rengarenga, renga lily, New Zealand rock lily, rengarenga, or maikaika) is a species of herbaceous perennial plant, endemic to New Zealand, where it may once have been farmed.

[4] The Māori name rengarenga is a reduplication of Proto-Polynesian *renga which in other related languages corresponds to turmeric, especially its powdered form (see Samoan: lega, Hawaiian: lena); this association is due to both plants' similar stem and root characteristics.

The stamens are tricoloured - purple and white, with yellow at the curled end.

)[1][2] It occurs naturally north of Greymouth and Kaikōura near the sea and, as the name suggests, usually on rocks.

William Colenso believed, for two reasons, that this plant was once cultivated by them: firstly, the plant grows much larger under cultivation than it usually does in the wild; and secondly it was often found near old deserted Māori homes and plantations.