Diuris tinkeri
{{Short description|Species of orchid}}
{{Speciesbox
| name =
| image = Diuris tinkeri.jpg
| image_caption = Near Regans Ford
| status =
| status_system =
| status_ref =
| genus = Diuris
| species = tinkeri
| authority = D.L.Jones & C.J.French{{cite web|title=Diuris tinkeri|url= https://biodiversity.org.au/nsl/services/apc-format/display/166845|publisher=Australian Plant Census|access-date=28 August 2023}}
}}
Diuris tinkeri, commonly known as Arrowsmith donkey orchid,{{FloraBase|name=Diuris tinkeri|id=44162}} is a species of orchid that is endemic to the south-west of Western Australia. It has two or three linear to lance-shaped leaves and up to seven yellow flowers suffused with reddish-purple to purple.
Description
Diuris tinkeri is a tuberous, perennial herb with two or three linear to lance-shaped leaves {{cvt|80–250|mm}} long and {{cvt|4–7|mm}} wide. Up to seven yellow flowers suffused with reddish-purple to purple, {{cvt|28–40|mm}} long and {{cvt|22–30|mm}} wide are borne on a flowering stem {{cvt|250–500|mm}} tall. The dorsal sepal is egg-shaped, {{cvt|10–13|mm}} long and {{cvt|12–16|mm}} wide, the lateral sepals narrowly oblong and crossed, {{cvt|15–22|mm}} long and {{cvt|2.5–3.5|mm}} wide. The petal blades are broadly elliptic, {{cvt|12–18|mm}} long and {{cvt|9–13|mm}} wide on a reddish-brown stalk {{cvt|3–5|mm}} long. The labellum is {{cvt|8–12|mm}} long with three lobes - the middle lobe wedge-shaped, {{cvt|8–12|mm}} long and {{cvt|8–11|mm}} wide, the side lobes spread widely apart and oblong, {{cvt|8–10|mm}} long and {{cvt|4–6|mm}} wide. There is a single smooth, yellow callus ridge {{cvt|4–6|mm}} long, along the mid-line of the labellum. Flowering occurs from mid-August to early October.{{cite book|last1=Brown|first1=Andrew|last2=Dixon|first2=Kingsley|last3=French|first3=Christopher|last4=Hopper|first4=Stephen|title=Orchids of Western Australia|date=2008|publisher=University of Western Australia Press|location=Crawley, Western Australia|isbn=9780980348149|page=216}}{{cite journal |last1=Jones |first1=David L. |last2=French |first2=Christopher J. |title=Diuris tinkeri, a new species in the Diuris corymbosa complex from Western Australia with affinities to Diuris magnifica. |journal=Australian Orchid Review |date=2016 |volume=78 |issue=4 |pages=37–40 |url=https://www.biodiversitylibrary.org/item/310587#page/39/mode/1up |access-date=28 August 2023}}
Taxonomy and naming
Diuris tinkeri was first formally described in 2013 by David Jones and Christopher J. French in Australian Orchid Review, from a specimen collected in the Western Flora Caravan Park near Eneabba in 1997.{{cite web|title=Duiris tinkeri|url= https://id.biodiversity.org.au/instance/apni/770735|publisher=APNI|accessdate=28 August 2023}} The specific epithet (tinkeri) honours Allan Tinker, who recognised the distinctiveness of the species.
Distribution and habitat
Arrowsmith donkey orchid grows in woodland, shrubland and kwongan in near-coastal areas, from near Geraldton to near Yanchep in the Geraldton Sandplains, Jarrah Forest and Swan Coastal Plain bioregions of south-western Western Australia.
Conservation
Diuris tinkeri is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.