Plinthanthesis is a genus of Australian plants in the grass family.

Species

• Plinthanthesis paradoxa (R.Br.) S.T.Blake - New South Wales, Victoria
• Plinthanthesis rodwayi (C.E.Hubb.) S.T.Blake - New South Wales
• Plinthanthesis urvillei Steud. - New South Wales

formerly included

see Rytidosperma

• Plinthanthesis tenuior - Rytidosperma tenuius

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