Olearia cassiniae

{{short description|Species of shrub}}

{{Speciesbox

|image =

|image_caption =

|genus = Olearia

|species = cassiniae

|status_system =

|status =

|authority = (F.Muell.) F.Muell. ex Benth.{{cite web|title=Olearia cassiniae|url= https://biodiversity.org.au/nsl/services/apc-format/display/103855|publisher=Australian Plant Census|access-date=15 March 2022}}

|synonyms_ref =

|synonyms =

• Aster cassiniae F.Muell.
• Olearia cassiniae F.Muell. nom. inval., pro syn.

}}

Olearia cassiniae is a species of flowering plant in the family Asteraceae and is endemic to the south-west of Western Australia. It is an erect or spreading shrub that typically grows to a height of {{cvt|0.7–1.8|m}} and produces white daisy-like inflorescences, mostly between February and April.{{FloraBase|name=Olearia cassiniae|id=8130}} The species was first formally described in 1865 by Ferdinand von Mueller who gave it the name Aster cassiniae in Fragmenta Phytographiae Australiae from specimens collected by George Maxwell.{{cite web |title=Aster cassiniae |url=https://biodiversity.org.au/nsl/services/rest/name/apni/537136/api/apni-format |website=APNI |accessdate=15 March 2022}}{{cite book |last1=von Mueller |first1=Ferdinand |title=Fragmenta Phytographiae Australiae |volume=5 |date=1865 |publisher=Victorian Government Printer |location=Melbourne |page=68 |url=https://www.biodiversitylibrary.org/item/7222#page/76/mode/1up |access-date=15 March 2022}} In 1867, George Bentham changed the name to Olearia cassiniae in Flora Australiensis.{{cite web |title=Olearia cassiniae |url=https://biodiversity.org.au/nsl/services/rest/name/apni/532532/api/apni-format |website=APNI |accessdate=15 March 2022}} The specific epithet (cassiniae) is a reference to the genus Cassinia.{{cite book |last1=Sharr |first1=Francis Aubi |last2=George |first2=Alex |title=Western Australian Plant Names and Their Meanings |date=2019 |publisher=Four Gables Press |location=Kardinya, WA |isbn=9780958034180 |page=159 |edition=3rd}}

This olearia grows on sand dunes or in wetlands in the Esperance Plains, Jarrah Forest and Warren biogeographic regions of south-western Western Australia. It is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.