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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not reflected in Florabase, herbarium collections, or in the census. We are hoping to be able to reinstate services around December 15; we will provide an update at that time.

The notice period started at 9:00 am on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Monday, 15 December 2025 +08:00.

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Cirsium arvense (L.) Scop.
Canada Thistle

Reference
Fl.Carniol. Ed.2, 2:126 (1772)
Conservation Code
Not threatened
Naturalised Status
Alien to Western Australia
Name Status
Current

Erect, spiny rhizomatous, perennial, herb, to 1 m high. Fl. blue-purple. Weed of pastures & roadsides.

Amanda Spooner, Descriptive Catalogue, 29 April 1997

Distribution

IBRA Regions
Geraldton Sandplains, Swan Coastal Plain, Warren.
IBRA Subregions
Geraldton Hills, Perth, Warren.
Local Government Areas (LGAs)
Greater Geraldton, Manjimup, Melville.