Diuris immaculata

Diuris immaculata is a tuberous, perennial herb with between four and six linear to lance-shaped leaves {{convert|40-80|mm|in|sigfig=1|abbr=on}} long, {{convert|1-3|mm|in|sigfig=1|abbr=on}} wide and folded lengthwise. Up to three golden yellow flowers without markings, {{convert|15-18|mm|in|sigfig=1|abbr=on}} long and {{convert|9-12|mm|in|sigfig=1|abbr=on}} wide are borne on a flowering stem {{convert|80-300|mm|in|sigfig=1|abbr=on}} tall. The dorsal sepal is egg-shaped, {{convert|9-14|mm|in|sigfig=1|abbr=on}} long, {{convert|5-7|mm|in|sigfig=1|abbr=on}} wide and curves upwards. The lateral sepals are oblong to egg-shaped with the narrower end towards the base, {{convert|10-16|mm|in|sigfig=1|abbr=on}} long, {{convert|2.5-4|mm|in|sigfig=1|abbr=on}} wide, held below the horizontal and parallel to each other. The petals are held above horizontal, egg-shaped to elliptic, {{convert|7-12|mm|in|sigfig=1|abbr=on}} long and {{convert|6-8|mm|in|sigfig=1|abbr=on}} wide on a green stalk {{convert|3-4|mm|in|sigfig=1|abbr=on}} long. The labellum is {{convert|10-13|mm|in|sigfig=1|abbr=on}} long, turns slightly downwards and has three lobes. The centre lobe is broadly egg-shaped to wedge-shaped, {{convert|8-11|mm|in|sigfig=1|abbr=on}} long and {{convert|7-11|mm|in|sigfig=1|abbr=on}} wide. The side lobes are egg-shaped with the narrower end towards the base, {{convert|4.5-7|mm|in|sigfig=1|abbr=on}} long and {{convert|2.5-4|mm|in|sigfig=1|abbr=on}} wide. There are two callus ridges {{convert|4.5|mm|in|sigfig=1|abbr=on}} long spreading apart from each other, near the mid-line of the labellum. Flowering occurs from September to November after fire.{{cite book|last1=Brown|first1=Andrew|last2=Dundas|first2=Pat|last3=Dixon|first3=Kingsley|last4=Hopper|first4=Stephen|title=Orchids of Western Australia|date=2008|publisher=University of Western Australia Press|location=Crawley, Western Australia|isbn=9780980296457|page=224}}{{cite journal|last1=Jones|first1=David L.|title=Miscellaneous new species of Australian Orchidaceae|journal=Australian Orchid Research|date=2006|volume=5|pages =80–81}}{{cite book|last1=Hoffman|first1=Noel|last2=Brown|first2=Andrew|title=Orchids of South-West Australia|date=2011|publisher=Noel Hoffman|location=Gooseberry Hill|isbn=9780646562322|page=490|edition=3rd}}

Diuris immaculata was first formally described in 2006 by David Jones from a specimen collected north-east of Esperance and the description was published in Australian Orchid Research.{{cite web|title=Duiris immaculata|url= https://id.biodiversity.org.au/instance/apni/616356|publisher=APNI|accessdate=24 March 2018}} The specific epithet (immaculata) is a Latin word meaning "unstained" or "unspotted",{{cite book|last1=Brown|first1=Roland Wilbur|title=The Composition of Scientific Words|date=1956|publisher=Smithsonian Institution Press|location=Washington, D.C.|page =653}} referring to the pure yellow colour of the flowers of this orchid.

The little Esperance bee orchid grows in winter-wet areas from north-east of Esperance to the Cape Arid National Park.

Diuris immaculata is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife,{{FloraBase|name=Diuris immaculata|id=33159}}

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immaculata

Category:Endemic orchids of Australia

Category:Orchids of Western Australia

Category:Plants described in 2006

Category:Taxa named by David L. Jones (botanist)