Gahnia vitiensis is a tussock-forming perennial in the family Cyperaceae, that is native to Fiji, the Samoan Islands, and the Hawaiian Islands.
Two subspecies are accepted. Gahnia vitiensis subsp. kauaiensis (synonym Gahnia kauaiensis ) – Hawaiian Islands (Kauai). The IUCN Red List assesses this subspecies as Endangered. Gahnia vitiensis subsp. vitiensis – Fiji and the Samoan Islands
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