Pterostylis mirabilis

Nodding rufous-hood
Pterostylis mirabilis growing near Cleve
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. mirabilis
Binomial name
Pterostylis mirabilis
Synonyms[1]

Oligochaetochilus mirabilis (R.Br.) Szlach.

Pterostylis mirabilis, commonly known as the nodding rufous-hood, is a plant in the orchid family Orchidaceae and is endemic to South Australia. It has a rosette of leaves at its base and up to ten greenish-white flowers with a narrow hood, down-turned lateral sepals and a thin-textured, insect-like labellum.

Description

Pterostylis mirabilis, is a terrestrial, perennial, deciduous, herb with an underground tuber. It has a rosette of between five and twelve egg-shaped, overlapping leaves which are about 20 mm (0.8 in) long and 4–8 mm (0.2–0.3 in) wide. Flowering plants have a rosette at the base of the flowering spike but the leaves are usually withered by flowering time. Up to ten greenish-white flowers which lean forward on a separate stalk are borne on a flowering stem up to 80 mm (3 in) tall. The dorsal sepal and petals form a hood or "galea" over the column with the dorsal sepal having a narrow tip 15 mm (0.6 in) long. The lateral sepals are narrow and turn downwards and suddenly narrow to thread-like tips up to 25 mm (1 in) long. The labellum is thinly-textured, green to pale brown and insect-like, about 8 mm (0.3 in) long with two hairs about 2 mm (0.08 in) long on the "head" end and eight to eleven shorter ones on each side of the "body".[2]

Taxonomy and naming

This orchid was first formally described in 2007 by David Jones and given the name Oligochaetochilus mirabilis from a specimen collected near the road from Cowell to Kimba. The description was published in The Orchadian.[3] In 2008, Robert Bates changed the name to Pterostylis mirabilis.[1] The specific epithet (mirabilis) is a Latin word meaning "wonderful" or "strange".[4]

Distribution and habitat

The nodding rufous-hood grows in rocky, hilly places, often under Melaleuca uncinata scrub. It is only known from about twelve locations on the Eyre Peninsula.[2]

Conservation

Pterostylis mirabilis is listed as "vulnerable" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. The main threats to the species are habitat fragmentation, weed invasion, inappropriate fire regimes and agricultural practices.[2]

References

  1. ^ a b c "Pterostylis mirabilis". APNI. Retrieved 28 June 2017.
  2. ^ a b c "Approved Conservation Advice for Pterostylis sp. Eyre Peninsula (R. Bates 19474)" (PDF). Australian Government Department of the Environment. Retrieved 3 July 2017.
  3. ^ "Oligochaetochilus mirabilis". APNI. Retrieved 3 July 2017.
  4. ^ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 527.

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