Phormium colensoi (syn. Phormium cookianum; mountain flax, lesser New Zealand flax, or wharariki in Māori) is a perennial plant that is native to New Zealand. It is less common than the other Phormium species, P. tenax. The greenish, yellow or orange flowers are followed by twisted seed pods.
The leaves are under 2m in length while those of P. tenax range from 1 to 3m in length. The scape is much shorter than that of P. tenax, rising up to 2m in height while that of P. tenax is around 5m in height.