A new, dodecaploid species of Uncinia (Cyperaceae) from ultramafic rocks, Surville Cliffs, Northland, New Zealand

A new species, Uncinia perplexa, is described from the Surville Cliffs, Nor thland, New Zealand. Uncinia perplexa has leaves 2-5 mm wide, 15-24 female florets per spike, the utricles are glabrous, ovate, and have a conspicuous beak, and the female glumes are membranous and deciduous. Uncinia perplexa occurs naturally only on ultramafic soils where it grows under Metrosidero s excelsus forest. The chromosome number is 2n = 12x = 132, and this is a n ew number for Uncinia. Information is provided on the species habitat, dist ribution, abundance, and conservation status.