Eriostemon is a 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...

 of flowering plants belonging to the family Rutaceae

Rutaceae

Rutaceae, commonly known as the rue or citrus family, is a family of flowering plants, usually placed in the order Sapindales.Species of the family generally have flowers that divide into four or five parts, usually with strong scents...

. It is native to eastern Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 and includes just two species. Eriostemon australasius occurs between Fraser Island and Nowra, and is a shrub of heathlands and low open woodlands. It is also frequently cultivated in Australian gardens and has showy pink, five-petalled flowers. Eriostemon banksii is endemic to Cape York Peninsula

Cape York Peninsula

Cape York Peninsula is a large remote peninsula located in Far North Queensland at the tip of the state of Queensland, Australia, the largest unspoilt wilderness in northern Australia and one of the last remaining wilderness areas on Earth...

 and is a shrub or small tree occurring in heathland and vinethicket margins; it is not known in cultivation.

A large number of species once classified within the genus have been placed in the newer genus Philotheca

Philotheca

Philotheca is a genus of flowering plants belonging to the family Rutaceae. Many plants formerly in Eriostemon are now in this genus....

. http://farrer.csu.edu.au/ASGAP/APOL13/mar99-3.html