Diplarrena

{{Short description|Genus of flowering plants}}

{{Use Australian English|date=August 2024}}

{{Automatic taxobox

|image = Diplarrena_moraea.jpg

|image_caption = Diplarrena moraea

|display_parents = 2

|parent_authority = Goldblatt

|taxon = Diplarrena

|authority = Labill.

|type_species = Diplarrena moraea

|type_species_authority = Labillardière

|subdivision_ranks = Species

|subdivision = Diplarrena moraea

Diplarrena latifolia

}}

Diplarrena is a genus of flowering plants in the family Iridaceae. The two species are endemic to Australia.{{cite web |url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Diplarrena |title=Genus Diplarrena |accessdate=1 July 2013 |author1=James, T.A. |author2=Brown, E.A. |work= PlantNET - New South Wales Flora Online |publisher=Royal Botanic Gardens & Domain Trust, Sydney Australia}} The name is from Greek diploos ("double") and arren ("male");{{cite book |author1=Manning, John |author2=Goldblatt, Peter |title=The Iris Family: Natural History & Classification |publisher=Timber Press |location=Portland, Oregon|pages=199–200 |year=2008|isbn=978-0-88192-897-6}} plants in the genus have only two functional stamens, while all other Iridaceae have three. The name is often misspelled Diplarrhena, an error that began with George Bentham's Flora Australiensis in 1873.

These plants are tufted perennial herbs with short rhizomes. The leaves are basal, linear, flat, and present all year. The stem is erect, with a few reduced leaves. Flowers appear one at a time from a green terminal spathe. They are iris-like but distinctly zygomorphic. There are six white tepals and a style with two thread-like branches.

There are two species:

class="wikitable"
Image	Scientific name	Description	Distribution
120px	Diplarrena moraea {{au|Labill. 1800}}	It has leaves up to a centimeter wide. The flowers are 5 to 6 centimeters wide, with blunt-tipped outer tepals 1.5 to 2.5 centimeters wide. The inner tepals are often tinged or veined with purple, and are yellowish at the tips.	Tasmania, Victoria and New South Wales.
120px	Diplarrena latifolia {{au|Benth. 1873}}	Larger plant with leaves 1 to 2.2 centimeters wide. The flowers are 6 to 8 centimeters wide with strongly purple-veined, yellow-tipped inner tepals. The species may be a regional variant of D. moraea.	Tasmania

The cultivar 'Amethyst Fairy' is a large-flowered selection with darker markings on the inner tepals.