Onychosepalum is a plant genus in the family Restionaceae, described as a genus in 1855.Steudel, Ernst Gottlieb von. 1855. Synopsis Plantarum Glumacearum 2: 249Tropicos, Onychosepalum Steud.
The entire genus is endemic to the State of Western Australia.Kew World Checklist of Selected Plant Families
Species Onychosepalum laxiflorum Steud. Onychosepalum microcarpum Meney & Pate Onychosepalum nodatum B.G.Briggs & L.A.S.Johnson
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