Untidy elbow orchid
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Genus: Arthrochilus
Species:
A. apectus
Binomial name
Arthrochilus apectus

Arthrochilus oreophilus, commonly known as the untidy elbow orchid,[2] is a flowering plant in the orchid family (Orchidaceae) and is endemic to near the tip of Cape York in Queensland. It has two or three leaves at its base and up to seven pale green, insect-like flowers with reddish glands on its labellum.

Description

Arthrochilus apectus is a terrestrial, perennial, deciduous, sympodial herb with an underground tuber which produces daughter tubers on the end of root-like stolons. It has two or three leaves at its base, each leaf 20–50 mm (0.8–2 in) long and 4–10 mm (0.2–0.4 in) wide. Between three and seven insect-like flowers 9–11 mm (0.35–0.43 in) long are borne on a flowering stem 180–260 mm (7–10 in) tall. The dorsal sepal is 9–11 mm (0.35–0.43 in) long, about 1.5 mm (0.06 in) wide and the lateral sepals are 7–8.5 mm (0.28–0.33 in) long and about 1.5 mm (0.06 in) wide. The petals are 8–9 mm (0.3–0.4 in) long, about 0.5 mm (0.02 in) wide. The petals and lateral sepals turn backwards against the ovary. The labellum has a purple base and is about 3.5 mm (0.1 in) long, 1 mm (0.04 in) on a stalk or "claw" 3.5 mm (0.1 in) long. The callus is about 3.5 mm (0.1 in) long with its central part covered with many tiny, shiny, hair-like glands and the tip is about 1 mm (0.04 in) wide with shiny black glands. Flowering occurs from November to February.[2]

Taxonomy and naming

Arthrochilus apectus was first formally described in 2004 by David Jones from a specimen collected in the Heathlands Reserve near the tip of Cape York. The description was published in The Orchadian.[3] The specific epithet (apectus) is from the Ancient Greek word apektos meaning "uncombed" or "unkempt".[4]

Distribution and habitat

The untidy elbow orchid grows in forest on the northern part of the Cape York Peninsula.[2]

Ecology

As with other Arthrochilus orchids, A. apectus is pollinated by male thynnid wasps of the genus Arthrothynnus although the species involved is not known. It also reproduces asexually by producing new tubers.[5]

References

  1. ↑ "Arthrochilus oreophilus". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. 1 2 3 Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. pp. 150–151. ISBN 1877069124.
  3. ↑ "Arthrochilus apectus". APNI. Retrieved 27 April 2018.
  4. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 228.
  5. ↑ "Arthrochilus". Australian National Botanic Garden. Retrieved 26 April 2018.
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