A family of about 300 genera and 3000 species, cosmopolitan; about 25-30 genera occur naturally in Australia.
Centella - A genus of 50 species predominately in southern Africa and tropical to subtropical regions of the world, two species naturalised in Australia..
Hydrocotyle - A genus of 75 to over 130 species with a worldwide distribution but well represented in the southern hemisphere. About 30 species occur naturally in Australia. Bean & Henwood (2003).
Trachymene - A genus of about 45 species, mainly in Australia but also in Malesia and the Pacific Islands; about 35 species occur naturally in Australia.
Bean, A.R. .& Henwood, M.J. (2003). Six new species of Hydrocotyle L. (Apiaceae) from Queensland. Austrobaileya 6:537-548.
Buwalda, P. (1953) Flora Malesiana Series I 4: 113-140 (116-117).
Eichler, Hj. (1987) Feddes Repertorium 98: 1-51 (11-23).
Holland, A.E. (1989). Notes on Trachymene Rudge (Apiaceae) in Queensland, I. Austrobaileya 3:135-139.
Powell, J.M. (1992). Apiaceae. In Harden, G.J. (Ed.) 'Flora of New South Wales.' Vol. 3, (New South Wales University Press: Kensington.), pp. 87-116.