Diuris dendrobioides

From Wikipedia, the free encyclopedia

Wedge diuris
Diuris dendrobioides 03.jpg
Diuris dendrobioides growing near Invergowrie
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Diuris
Species:
D. dendrobioides
Binomial name
Diuris dendrobioides
Fitzg.

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.

Description[]

Diuris dendrobioides is a tuberous, perennial herb with one or two linear leaves 100–250 mm (4–10 in) long, 3–4 mm (0.1–0.2 in) wide and folded in half lengthwise. Between two and six pale lilac-coloured to mauve flowers with darker markings and 20–35 mm (0.8–1 in) wide are borne on a flowering stem 20–40 mm (0.8–2 in) high. The dorsal sepal is egg-shaped, 10–20 mm (0.4–0.8 in) long, 5–12 mm (0.2–0.5 in) wide angled upwards with curled edges. The lateral sepals are linear to lance-shaped, 35–65 mm (1–3 in) long, 1.5–3 mm (0.06–0.1 in) wide, and turn downwards. The petals are erect, ear-like above the flower, 7–13 mm (0.3–0.5 in) long and 5–9 mm (0.2–0.4 in) wide on a greenish purple, stalk-like "claw" 6–8 mm (0.2–0.3 in) long which gradually merges with the egg-shaped "ear". The labellum is 7–13 mm (0.3–0.5 in) long and has three lobes. The centre lobe is fan-shaped to almost circular, 6.5–11 mm (0.3–0.4 in) wide with a ridge along its mid-line. The lateral lobes are linear egg-shaped with the narrower end toward the base, 3–5 mm (0.1–0.2 in) long and 1–3 mm (0.04–0.1 in) wide. There are two broad ridge-like calli 3–6 mm (0.1–0.2 in) long either side of the central labellum ridge. Flowering occurs from September to January.[1][2]

Diuris dendrobioides habit, east of Walcha

Taxonomy and naming[]

Diuris dendrobioides was first formally described in 1882 by Robert FitzGerald from a specimen collected near Murrumburrah and the description was published in his book Australian Orchids.[3] The specific epithet (dendrobioides) refers to a resemblance of this orchid to a species of Dendrobium. The Latin ending -oides means "resembling" or "having the form of".[4][5]

This species is listed in the Index Kewensis as a synonym of Diuris punctata var. punctata.[6]

Distribution and habitat[]

The wedge diuris grows amongst grasses in forest. It is widespread in the eastern half of New South Wales but is rare in Victoria, occurring only near Wodonga.[1][2]

Conservation[]

Diuris dendrobioides is listed as "Endangered" in the Victorian Flora and Fauna Guarantee Act 1988.[2]

References[]

  1. ^ a b Jones, David L.; Weston, Peter H.; Orme, Andrew. "Diuris dendrobioides". Royal Botanic Garden Sydney: plantNET. Retrieved 12 November 2017.
  2. ^ a b c Jeanes, Jeff. "Diuris dendrobioides". Royal Botanic Gardens Victoria. Retrieved 30 November 2017.
  3. ^ "Duiris dendrobioides". APNI. Retrieved 30 November 2017.
  4. ^ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 483.
  5. ^ Jones, David L.; Egan, Jean; Wood, Tony (2008). Field guide to the orchids of the Australian Capital Territory. Canberra: National Parks Association of the ACT. pp. 114–115. ISBN 0980285429.
  6. ^ "Diuris dendrobioides". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
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