Olearia rudis
{{short description|Species of plant}}
{{Use Australian English|date=July 2022}}
{{Use dmy dates|date=July 2022}}
{{Speciesbox
|image = Olearia rudis.jpg
|image_caption =
|genus = Olearia
|species = rudis
|authority = (Benth.) F.Muell. ex Benth.{{cite web|title=Olearia rudis|url= https://biodiversity.org.au/nsl/services/apc-format/display/106437|publisher=Australian Plant Census|access-date=13 July 2022}}
|synonyms = {{collapsible list|
- Aster exul Lindl.
- Eurybia rudis Benth.
- Eurybia rudis var. arguta Benth.
- Eurybia rudis Benth. var. rudis
- Eurybia scabra Benth.
- Olearia rudis F.Muell. nom. inval., pro syn.
- Olearia rudis var. glabriuscula Benth.
- Olearia rudis (Benth.) F.Muell. ex Benth. var. rudis
- Olearia rudis var. scabra (Benth.) Benth.
- Shawia rudis (Benth.) Sch.Bip.
- Shawia scabra (Benth.) Sch.Bip.
}}
}}
File:Olearia rudis habit.jpg]]
Olearia rudis, commonly known as azure daisy-bush,{{cite web |last1=Walsh |first1=Neville G. |last2=Lander |first2=Nicholas S. |title=Olearia rudis |url=https://vicflora.rbg.vic.gov.au/flora/taxon/a435b15a-4970-4f67-b699-83314cdae87b |publisher=Royal Botanic Gardens Victoria |access-date=13 July 2022}} is a species of flowering plant in the family Asteraceae and is endemic to eastern Australia. It is a usually short-lived shrub with crowded elliptic or egg-shaped leaves, and pale blue, mauve or purple and orange, daisy-like inflorescences.
Description
Olearia rudis is a stiff, usually short-lived shrub or subshrub that typically grows to a height of up to about {{cvt|1.3|m}}, its branchlets usually bristly-hairy. It has crowded elliptic or egg-shaped leaves with the narrower end towards the base, {{cvt|15–45|mm}} long and {{cvt|7–18|mm}} wide. Both surface of the leaves are bristly-hairy, the edges are often serrated, and the base is slightly stem-clasping. The heads or daisy-like "flowers" are arranged singly or in corymbs on the ends of branches or in leaf axils on a peduncle {{cvt|20–50|mm}} and are {{cvt|25–50|mm}} in diameter. Each head has 40 to 75 pale blue, mauve or purple ray florets, the ligule {{cvt|10–20|mm}} long, surrounding 60 to 250 orange disc florets. Flowering occurs from July to October and the fruit is a glabrous achene, the pappus {{cvt|5–7|mm}} long.{{cite web |last1=Lander |first1=Nicholas S. |title=Olearia rudis |url=https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Olearia~rosmarinifolia |publisher=Royal Botanic Garden Sydney |access-date=11 July 2022}}{{cite web |title=Olearia rudis |url=http://www.flora.sa.gov.au/cgi-bin/speciesfacts_display.cgi?form=speciesfacts&name=Olearia_rudis |publisher=State Herbarium of South Australia |access-date=13 July 2022}}
Taxonomy
This daisy was first formally described in 1837 by George Bentham who gave it the name Eurybia rudis in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel from specimens collected near the Swan River.{{cite web|title=Eurybia rudis|url= https://id.biodiversity.org.au/instance/apni/531811 |publisher=APNI|access-date=13 July 2022}} In 1867, Bentham changed the name to Olearia rudis in Flora Australiensis.{{cite web|title=Olearia rudis|url= https://id.biodiversity.org.au/instance/apni/536405 |publisher=APNI|access-date=13 July 2022}} The specific epithet (rudis) means "rough" or "wild".{{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=298 |edition=3rd}}
Distribution and habitat
Olearia rudis grows in mallee and woodland in western New South Wales, north-western Victoria and the south-east of South Australia.