Olearia arckaringensis
{{short description|Species of shrub}}
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|image =
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|genus = Olearia
|species = arckaringensis
|status_system = EPBC
|status = EN
|authority = Lang{{cite web|title=Olearia arckaringensis|url= https://biodiversity.org.au/nsl/services/apc-format/display/216055|publisher=Australian Plant Census|access-date=18 February 2022}}
|synonyms_ref =
|synonyms =
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Olearia arckaringensis, commonly known as Arckaringensis daisy,{{cite web |title=Conservation advice - Olearia arckaringensis |url=https://www.environment.gov.au/biodiversity/threatened/species/pubs/86648-conservation-advice-07122016.pdf |publisher=Australian Government Department of the Environment |access-date=18 February 2022}} is a species of flowering plant in the family Asteraceae and is endemic to a restricted area of northern South Australia. It is a small, compact, rounded shrub with woolly-hairy foliage, coarsely-toothed, elliptic leaves and lavender or white and yellow, daisy-like inflorescences.
Description
Olearia arckaringensis is a small, compact, rounded shrub with a thick, woody base, its stems covered with white, woolly hairs. The leaves are elliptic, {{cvt|13–17|mm}} long and {{cvt|5–16|mm}} wide on a petiole {{cvt|2–5|mm}} long and white woolly-hairy with four to eight coarse teeth on the edges. The heads are arranged singly on the ends of branchlets, each head or daisy-like "flower" on a peduncle {{cvt|40–80|mm}} long with 61–80 outer involucral bracts. There are 36 to 60 ray florets, the petal-like ligule lavender or white and {{cvt|11–18|mm}} long, surrounding 44–72 yellow disc florets. The fruit is a hairy, light brown cypsela {{cvt|2.0–2.6|mm}} long, the pappus with 18–28 bristles.{{cite journal |last1=Lang |first1=Peter J. |title=Olearia arckaringensis (Asteraceae: Astereae), a new endangered daisy-bush from northern South Australia |journal=Journal of the Adelaide Botanic Gardens |date=2008 |volume=22 |pages=57–61 |url=https://data.environment.sa.gov.au/Content/Publications/JABG22P057_Lang.pdf |access-date=18 February 2022}}
Taxonomy and naming
Olearia arckaringensis was first formally described in 2008 by Peter J. Lang in the Journal of the Adelaide Botanic Gardens from specimens collected on Arckaringa Station in 2000.{{cite web |title=Olearia arckaringensis |url=https://biodiversity.org.au/nsl/services/rest/name/apni/640971/api/apni-format |website=APNI |accessdate=18 February 2022}} The specific epithet (arckaringensis) refers to the type location.
Distribution and habitat
Conservation status
Arckaringensis daisy is listed as "endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. The main threats to the species include grazing and trampling by feral animals and livestock.