What is "argyrotegium"

Argyrotegium is a genus of plants in the sunflower family, native to Australia and New Zealand.

1. Argyrotegium fordianum (M.Gray) J.M.Ward & Breitw. - New South Wales, Victoria, Tasmania
2. Argyrotegium mackayi (Buchanan) J.M.Ward & Breitw. - New Zealand (North + South), Victoria, Tasmania
3. Argyrotegium nitidulum (Hook.f.) J.M.Ward & Breitw. - New Zealand (South), Victoria, Tasmania
4. Argyrotegium poliochlorum (N.G.Walsh) J.M.Ward & Breitw. - New South Wales, Victoria, Tasmania