Carex uncinata, the Hawai'i birdcatching sedge, hook grass, hook sedge, bastard grass, kamu or matau-a-maui, is a species of flowering plant in the sedge family, Cyperaceae.Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.
Carex uncinata is native to New Zealand (including the Antipodes), the Society Islands, and Hawaii.Kew World Checklist of Selected Plant Families Its natural habitat is from the coast up to , where it is found in areas ranging from native forest to shrubland.
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