Pterostylis conferta

Leprechaun greenhood
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Genus: Pterostylis
Species: P. conferta
Binomial name
Pterostylis conferta
(D.L.Jones) G.N.Backh.[1]
Synonyms[1]

Pterostylis conferta, commonly known as the leprechaun greenhood or basalt midget greenhood,[2] is a plant in the orchid family Orchidaceae and is endemic to Victoria. It has a rosette of leaves at the base of the flowering stem and up to sixteen pale green flowers in a short, crowded spike. It is a very rare orchid, similar to P. mutica, its distribution much reduced by urbanisation and agriculture.

Description

Pterostylis conferta, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of between five and ten, egg-shaped leaves, each leaf 5–25 mm (0.2–1 in) long and 3–8 mm (0.1–0.3 in) wide. Flowering plants have a similar rosette at the base of a flowering stem which is up to 160 mm (6 in) high with between five and sixteen crowded, pale green flowers with darker green stripes. The dorsal sepal and petals are joined to form a hood called the "galea" over the column and which curves forward and then downwards with a pointed tip. The lateral sepals are broadly egg-shaped, turn downwards and are 6–7 mm (0.2–0.3 in) long and wide. They are joined at their bases and their edges are rolled inwards. The labellum is about 3 mm (0.1 in) long and wide, pale green with a dark green appendage. Flowering occurs from October to January.[3][2]

Taxonomy and naming

The leprechaun greenhood was first formally described in 2009 by David Jones and given the name Hymenochilus confertus from a specimen collected near Woorndoo. The description was published in Orchadian.[4] In 2010 Gary Backhouse changed the name to Pterostylis conferta.[1] The specific epithet (conferta) is a Latin word meaning "pressed together", "crowded", "thick" or "dense".[5]

Distribution and habitat

Pterostylis conferta used to grow on basalt grassland but is now restricted to a single small population growing on a stony hill.[3][2]

Conservation

This greenhood orchid is classified as "threatened" under the Victorian Government Flora and Fauna Guarantee Act 1988.[2]

References

  1. 1 2 3 "Pterostylis conferta". APNI. Retrieved 23 June 2017.
  2. 1 2 3 4 "Leprechaun greenhood". Biodiversity of the Western Volcanic Plains. Retrieved 24 June 2017.
  3. 1 2 Jeanes, Jeff. "Pterostylis conferta". Royal Botanic Gardens Victoria: vicflora. Retrieved 24 June 2017.
  4. ↑ "Hymenochilus confertus confertus". APNI. Retrieved 23 June 2017.
  5. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 227.
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