Diuris venosa

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Veined doubletail
Diuris venosa (8290269452) - cropped.jpg
Diuris venosa growing in Barrington Tops National Park
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Diuris
Species:
D. venosa
Binomial name
Diuris venosa

Diuris venosa, commonly known as the veined doubletail is a species of orchid which is endemic to New South Wales. It has a few thin, erect leaves and up to four white to lilac-coloured flowers with deep red to purple blotches and lines.

Contents

Description

Diuris venosa is a tuberous, perennial, terrestrial herb, with three to five erect, thread-like leaves 5–12 cm (2–5 in) long and 1–3 mm (0.04–0.1 in) wide.

There are up to four flowers arranged on a raceme 10–40 cm (4–20 in) high, each flower about 25 mm (1 in) wide. The flowers are white to lilac-coloured with many purple lines and blotches. The dorsal sepal is broadly egg-shaped, 9–12 mm (0.4–0.5 in) long, 4–9 mm (0.2–0.4 in) wide and forms a hood over the column. The lateral sepals are linear to lance-shaped, 11–18 mm (0.4–0.7 in) long, 2–3.5 mm (0.08–0.1 in) wide and hang vertically below the flower. The petals are narrow egg-shaped, 3–10 mm (0.1–0.4 in) long, 3–6 mm (0.1–0.2 in) wide spreading more or less horizontally and resemble the shape of cow's ears. The labellum is 10–13 mm (0.4–0.5 in) long and is divided into three lobes. The lateral lobes are linear to wedge-shaped, 3–4 mm (0.1–0.2 in) long, 1–3 mm (0.04–0.1 in) wide with a wavy edge. The medial lobe is a broad egg-shape to almost circular when flattened, 6–11 mm (0.2–0.4 in) wide with a callus 5–6.5 mm (0.2–0.3 in) long. [1] [2]

Labelled image Diuris venosa labelled.jpg
Labelled image

Taxonomy and naming

Diuris venosa was first formally described in 1926 by Herman Rupp and the description was published in the journal, Victorian Naturalist . [3] [4] The specific epithet (venosa) is derived from a Latin word meaning "veiny". [5]

Distribution and habitat

This orchid is only found in New South Wales, in the Barrington Tops and New England National Parks, where it grows in swampy, grassy areas. [1]

Conservation

Diuris venosa is listed as "Vulnerable" (VU) under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). The threats to its survival include invasion by introduced weeds, particularly English broom ( Cytisus scoparius ), illegal removal of plants, and predation by feral pigs ( Sus scrofa ). [6]

Related Research Articles

<i>Diuris pardina</i> Species of orchid

Diuris pardina, commonly known as the leopard orchid or leopard doubletail is a species of orchid which is endemic to south-eastern Australia. It has two or three grass-like leaves and up to ten yellow flowers with reddish-brown marks and blotches.

Diuris maculata, commonly known as the spotted doubletail is a species of orchid which is endemic to New South Wales. It has up to two or three folded leaves and a flowering stem with up to eight yellow flowers with brown to blackish markings. It is similar to D. pardina which has darker flowers with larger brown markings.

<i>Diuris aequalis</i> Species of orchid

Diuris aequalis, commonly called the buttercup doubletail, is a species of orchid which is endemic to New South Wales. It has two rolled leaves and spikes of two to five golden-yellow to orange flowers and is classified as "vulnerable".

<i>Diuris abbreviata</i> Species of orchid

Diuris abbreviata, commonly known as the lemon doubletail, is a species of orchid that is endemic to eastern Australia. It has two or three leaves and a flowering stem with up to nine yellow flowers with darker markings.

<i>Diuris dendrobioides</i> Species of orchid

Diuris dendrobioides, commonly known as the wedge diuris, is a species of orchid which is endemic to eastern Australia. It has one or two leaves and a flowering stem with up to six pale lilac-coloured to mauve flowers with darker markings.

<i>Diuris praecox</i> Species of orchid

Diuris praecox, commonly known as the early doubletail, Newcastle doubletail or rough doubletail is a species of orchid which is endemic to New South Wales. It has two or three grass-like leaves and up to ten light yellow flowers with a few dark brown marks. It is threatened by urbanisation.

<i>Diuris arenaria</i> Species of orchid

Diuris arenaria, commonly known as the Tomaree donkey orchid or sand doubletail is a species of orchid which is endemic to a very small area of New South Wales. It has two grass-like leaves and up to nine mauve or light purple and white flowers. It has a very limited distribution near Newcastle.

Diuris bracteata is a species of orchid which is endemic to New South Wales. It has two folded leaves and up to eight yellow flowers with blackish marks. After its collection in a Sydney suburb in 1888, no further collections were made and the species was presumed extinct until 2004 when it was rediscovered near Gosford.

Diuris callitrophila, commonly known as the Oaklands doubletail or Oaklands diuris, is a species of orchid which is endemic to a small part of southern New South Wales. It has two or three leaves and up to nine whitish and mauve flowers with darker markings and unusually long lateral sepals.

Diuris disposita, commonly called the Macleay River doubletail or Willawarrin doubletail, is a species of orchid which is endemic to a small area in New South Wales. It has one or two linear leaves at its base and up to seven yellow flowers with brown markings. Only about fifty plants survive in grassy forest near Kempsey.

Diuris exitela, commonly called the Mount Moffat doubletail, is a species of orchid which is endemic to central western Queensland. It has two linear leaves at its base, up to twelve bright yellow flowers with dark brown markings and grows on sandstone cliffs and ridges.

Diuris flavescens, commonly called the pale yellow doubletail or Wingham doubletail, is a species of orchid which is endemic to a small area in New South Wales. It has two linear leaves at its base and up to five pale yellow flowers with dark brown markings. Fewer than 200 plants survive in grassy forest near Wingham.

Diuris fragrantissima, commonly called the fragrant doubletail or Sunshine diuris, is a species of orchid which is endemic to a small area to the west of Melbourne. It has two linear leaves at its base and up to twelve white flowers with mauve or pale purple markings with unusually long lateral sepals. Only about thirty plants survive in grassland near Sunshine.

Diuris luteola, commonly called the northern doubletail, is a species of orchid which is endemic to Queensland. It has a single linear leaf at its base and up to six pale yellow flowers with a few brown markings. It grows in shallow, stony soil on tablelands in eastern parts of the state.

<i>Diuris palustris</i> Species of orchid

Diuris palustris, commonly known as the swamp doubletail or swamp diuris is a species of orchid which is endemic to south-eastern Australia. It has a tuft of between eight and ten twisted leaves and up to four yellow flowers with brown spots and blotches marks and blotches.

<i>Diuris pedunculata</i> Species of orchid

Diuris pedunculata, commonly known as the small snake orchid, is a species of orchid which is endemic to New South Wales. It usually has two leaves at its base and one or two yellow and orange flowers with purple markings. It originally occurred in scattered populations between Tenterfield and the Hawkesbury River but because of habitat loss is now only known from the New England Tableland.

Diuris platichila, commonly known as the Blue Mountains doubletail, is a species of orchid that is endemic to a few isolated places in the Blue Mountains in New South Wales. It has two leaves and up to eight yellow flowers with dark markings on the dorsal sepal and labellum. It has relatively long, thin lateral sepals and the central lobe of the labellum is wedge-shaped. It forms hybrids with other species of Diuris.

<i>Diuris semilunulata</i> Species of orchid

Diuris semilunulata, commonly known as the late leopard orchid, is a species of orchid that is endemic to New South Wales and the Australian Capital Territory. It has two grass-like leaves and up to five orange-coloured flowers with brown and purple blotches.

Diuris striata is a poorly-known species of orchid that is endemic to New South Wales. It has a two grass-like leaves and about four mauve flowers with dark purple streaks on the labellum.

Diuris tricolor, commonly known as the long-tailed donkey orchid or pine donkey orchid, is a species of orchid that is endemic to New South Wales, although a single plant has been found in Victoria. It has up to three grass-like leaves and up to six orange-coloured to yellow flowers with white and purplish tints. The lateral sepals are unusually long.

References

  1. 1 2 Jones, David L. "Diuris venosa". Royal Botanic Gardens Sydney:plantNET. Retrieved 14 September 2016.
  2. "Veined Doubletail - profile". New South Wales Government Office of Environment and Heritage. Retrieved 14 September 2016.
  3. "Duiris venosa". APNI. Retrieved 14 September 2016.
  4. Rupp, Hermann (1926). "A new species of Diuris". The Victorian Naturalist. 43 (5): 153. Retrieved 14 September 2016.
  5. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 832.
  6. "Approved Conservation Advice for Diuris venosa (Veined Doubletail)" (PDF). Australian Government Department of Environment and Energy. Retrieved 14 September 2016.