Carex uncinata, the Hawai'i birdcatching sedge,[2] hook grass, hook sedge, bastard grass, kamu or matau-a-maui,[3] is a species of flowering plant in the sedge family, Cyperaceae.

[4] Carex uncinata is native to New Zealand (including the Antipodes), the Society Islands, and Hawaii.

[1] Its natural habitat is from the coast up to 1,000 m (3,300 ft), where it is found in areas ranging from native forest to shrubland.

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