Four species of Arthropodium R.Br. occurring in the Northern Territory, South Australia, Queensland, and New South Wales are newly described: Arthropodium boreale P.F.Horsfall & Jian Wang ter sp. nov., Arthropodium glareosorum P.F.Horsfall & Jian Wang ter sp. nov., Arthropodium morganiae P.F.Horsfall & Jian Wang ter sp. nov. and Arthropodium sejunctum P.F.Horsfall & Jian Wang ter sp. nov. The new species are illustrated and diagnosed against related species, their distributions mapped and a key to the new species provided.