Diuris setacea

Diuris setacea, commonly called the bristly donkey orchid,[2] is a species of orchid that is endemic to the south-west of Western Australia. It has a tuft of up to ten twisted leaves at its base and up to seven yellow flowers with a few brown markings. It grows in moist soil on granite outcrops and flowers much more prolifically after fire the previous summer.

Bristly donkey orchid
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Diuris
Species:
D. setacea
Binomial name
Diuris setacea

Description

Diuris setacea is a tuberous, perennial herb with between six and ten spirally twisted leaves in a tuft at its base. The leaves are 50–100 mm (2–4 in) long and 1–2 mm (0.04–0.08 in) wide. Between two and seven yellow flowers with brown markings, 25–30 mm (0.98–1.2 in) long and 20–30 mm (0.8–1 in) wide are borne on a flowering stem 150–300 mm (6–10 in) tall. The dorsal sepal is erect, 13–16 mm (0.5–0.6 in) long and 7–8 mm (0.28–0.31 in) wide. The lateral sepals are 15–18 mm (0.6–0.7 in) long, 2–3 mm (0.08–0.1 in) wide and turned downwards. The petals are more or less erect or bent backwards, 11–14 mm (0.4–0.6 in) long and 6–7 mm (0.24–0.28 in) wide on a greenish brown stalk 3–5 mm (0.12–0.20 in) long. The labellum is 12–14 mm (0.47–0.55 in) long and has three lobes. The centre lobe is diamond-shaped, 6–8 mm (0.2–0.3 in) wide and folded lengthwise. The side lobes are 4–6 mm (0.16–0.24 in) long and 4 mm (0.2 in) wide and spread apart from each other. There are two, ridge-like calli 5–7 mm (0.2–0.3 in) long and outlined in brown along the mid-line of the labellum. Flowering occurs from October to December but much more prolifically after fire the previous summer.[2][3][4]

Taxonomy and naming

Diuris setacea was first described in 1810 by Robert Brown and the description was published in his Prodromus Florae Novae Hollandiae et Insulae Van Diemen.[5][6] The specific epithet (setacea) is derived from the Latin word seta meaning "bristle".[7]

Distribution and habitat

The bristly donkey orchid grows in low heath in moist soil on granite outcrops between Esperance and Kalbarri.[3]

Conservation

Diuris setacea is classified as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[8]

References
  1. "Diuris setacea". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 125. ISBN 1877069124.
  3. Brown, Andrew; Dixon, Kingsley; French, Christopher; Brockman, Garry (2013). Field guide to the orchids of Western Australia : the definitive guide to the native orchids of Western Australia. Simon Nevill Publications. p. 230. ISBN 9780980348149.
  4. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 495. ISBN 9780646562322.
  5. "Duiris setacea". APNI. Retrieved 6 April 2018.
  6. Brown, Robert (1810). Prodromus Florae Novae Hollandiae et Insulae Van Diemen. London. p. 316. Retrieved 6 April 2018.
  7. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 392.
  8. "Diuris setacea". FloraBase. Western Australian Government Department of Parks and Wildlife.
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