Australis covers whole Australian continent. It has specific flora dependent on long-term isolation of this continent. We can find here 19 endemic families. The amount of endemic species is more than 80 %. Australis has a developmental relationship to South America, New Zealand and Indonesia.
- ALISMA PLANTAGO-AQUATICA L. – Common Water-plantain
- ARABIS GLABRA (L.) Bernh. – Tower Mustard
- BOTRYCHIUM LUNARIA (L.) Schwartz – Common Moonwort
- CAKILE MARITIMA Scop. – Sea Rocket, Two-head Sea Rocket, European Searocket
- CALLISTEMON RIGIDUS R. Br. – Stiff Bottlebrush, Bottlebrush Tree
- CAREX BUXBAUMII Wahlenb. – Buxbaum’s Sedge, Club Sedge
- CYPERUS ERAGROSTIS Lam. – Drain Flat Sedge, Pale Galingale, Umbrella Sedge
- GENTIANELLA MUELLERIANA (L. G. Adams) Glenny – Mueller’s Snow-gentian
- IPOMOEA PES-CAPRAE (L.) R. Br. – Railroad Vine, Bayhops
- IPOMOEA QUAMOCLIT L. – Cypress Vine, Cardinal Creeper, Cardinal Vine, Star Glory, Hummingbird Vine, Cypressvine Morning Glory
- MELALEUCA NESOPHILA F. Muell. – Showy Honey Myrtle
- MERREMIA UMBELLATA (L.) Hallier f. – Hogvine
- RUMOHRA ADIANTIFORMIS (G. Forst.) Ching – Leather Fern, Leatherleaf Fern
- SESUVIUM PORTULACASTRUM (L.) L. – Seaside Purslane, Shoreline Purslane, Sea Purslane
- SWAINSONA FORMOSA (G. Don) Joy Thomps – Sturt’s Desert Pea
- TODEA BARBARA (L.) T. Moore – King Fern, Crepe Fern