A family of three genera and six species centred mainly in Australia; three genera occur naturally in Australia.
Helmholtzia - A genus of three species in Australia and New Guinea; two species occur naturally in Australia. Adams (1987).
Philydrum - A monotypic genus in Asia to Australia.
Skottsburg, C. (1953). Flora Malesiana Series I 4: 5-7.
Evans, O.D. & Johnson, L.A.S. (1966). Philydraceae. Flora of New South Wales 31: 4-5.
Adams, L.G. (1987). Philydraceae. Flora of Australia. 45: 40-46.