Xanthosia rotundifolia, commonly known as southern cross, is a species of flowering plant in the family Apiaceae and is endemic to the south-west of Western Australia.

It is an erect, perennial herb with serrated or toothed leaves and white to creamy-yellow flowers.

Xanthosia rotundifolia is an erect perennial herb that typically grows to a height of up to 60 cm (24 in).

[2] Its leaves are round to egg-shaped or wedge-shaped, and leathery[2] with serrated or toothed edges.

[6] Southern cross grows in gravelly, lateritic soils in rocky places, swamps and open woodland in the Esperance Plains, Jarrah Forest and Warren bioregions of the south-west of Western Australia.