Erodium cygnorum is a species of herb native to Australia.
It is commonly known as blue heronsbill in Western Australia, and blue storksbill in South Australia. 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.
It grows as an annual or perennial herb up to 60 centimetres high, with blue, purple or pink flowers.
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.
- "Erodium cygnorum Nees". FloraBase. Western Australian Government Department of Parks and Wildlife.
- "Erodium cygnorum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA)., citing Jessop, J. P. & Toelken, H. R. (1986). Flora of South Australia (4th ed.).
- "Erodium cygnorum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 19 January 2016.
- "Erodium cygnorum Nees". CalFlora. Retrieved 2009-01-05.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "Erodium cygnorum subsp. glandulosum Carolin". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
- "Erodium cygnorum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA).
- Nees. "New South Wales Flora Online: Erodium cygnorum". Royal Botanic Gardens & Domain Trust, Sydney, Australia.
- Carolin. "New South Wales Flora Online: Erodium cygnorum subsp. glandulosum". Royal Botanic Gardens & Domain Trust, Sydney, Australia.
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