Prostanthera rotundifolia, the roundleaf mint bush, is one of about 90 Australian endemic species from the genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 Prostanthera

Prostanthera

Prostanthera, commonly known as Mintbush, is a genus of plants of the family Lamiaceae. There are about 90 species within the genus, all of which are endemic to Australia. The word is derived from the Greek, which refers to an appendage...

, known as Australian mints or native mints.

The plant is a branched woody shrub, which may reach up to 2 metres (6.6 ft). It has dark green round leaves 4–10 mm (0.15748031496063–0.393700787401575 ) long and produces cup-shaped purple flowers between September and October.

Its native distribution is in South Australia

South Australia

South Australia is a state of Australia in the southern central part of the country. It covers some of the most arid parts of the continent; with a total land area of , it is the fourth largest of Australia's six states and two territories.South Australia shares borders with all of the mainland...

, New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

, Victoria

Victoria (Australia)

Victoria is the second most populous state in Australia. Geographically the smallest mainland state, Victoria is bordered by New South Wales, South Australia, and Tasmania on Boundary Islet to the north, west and south respectively....

 and Tasmania

Tasmania

Tasmania is an Australian island and state. It is south of the continent, separated by Bass Strait. The state includes the island of Tasmania—the 26th largest island in the world—and the surrounding islands. The state has a population of 507,626 , of whom almost half reside in the greater Hobart...

. The species is listed as vulnerable in Tasmania.

Essential oils can be extracted from the leaves.