''Erodium cygnorum'' is a species of herb native to

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. It is commonly known as blue heronsbill in Western Australia, and blue storksbill in South Australia., citing In the United States, where the species is cultivated as a garden plant, it is commonly known as Australian stork's bill and Australian filaree. In the British Isles, it is commonly known as western stork's-bill.

Description

It grows as an annual or perennial herb up to 60 centimetres high, with blue, purple or pink flowers.

Taxonomy

This species was published in 1845, based on a specimen collected from the vicinity of Perth, Western Australia by Ludwig Preiss in 1839. In 1958, Roger Charles Carolin published a subspecies, ''Erodium cygnorum'' subsp. ''glandulosum'', but this has since been promoted to species rank as '' E. carolinianum''. No infraspecific taxa of ''E. cygnorum'' are currently recognised.

Distribution and habitat

It is native to Australia, occurring in Western Australia, South Australia and the Northern Territory. The National Herbarium of New South Wales lists ''E. cygnorum'' as also occurring in New South Wales, but they further identify their specimens as ''E. cygnorum'' subsp. ''glandulosum''; that is, ''E. carolinianum''. It favours red sand or clay loam, occurring in low-lying flats, along creeklines and on the margins of salt lakes.

References

Geraniales of Australia Rosids of Western Australia Flora of South Australia Flora of the Northern Territory cygnorum {{Geraniaceae-stub