Pterostylis porrecta

Shrimp-flowered greenhood
Scientific classification
Kingdom: Plantae
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Diurideae
Subtribe: Pterostylidinae
Genus: Pterostylis
Species: P. porrecta
Binomial name
Pterostylis porrecta
D.L.Jones, Molloy & M.A.Clem.[1]

Pterostylis porrecta is a species of greenhood orchid endemic to New Zealand. Flowering plants have spreading, grass-like leaves on the flowering stem and a single small, transparent white and green flower with the lateral sepals held close to horizontally in front of the flower.

Description

Pterostylis porrecta is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plant have a rosette of three or four linear to lance-shaped, dark green leaves which are 40–70 mm (2–3 in) long and 4–6 mm (0.16–0.24 in) wide. Flowering plants have a single transparent white flower with green lines and 18–22 mm (0.7–0.9 in) long on a flowering stem 60–200 mm (2–8 in) tall. There are also four or five linear to lance-shaped leaves 45–120 mm (2–5 in) long and 4–6 mm (0.16–0.24 in) wide with their bases wrapped around the flowering stem. The flower leans forward and the dorsal sepal and petals are fused, forming a hood or "galea" over the column. There is a wide gap between the galea and the lateral sepals which have long, tapering tips, spread apart from each other and held almost horizontally in front of the flower. The labellum is gently curved, greenish with a pink tip and does not protrude through the sinus between the lateral sepals.[2][3]

Taxonomy and naming

Pterostylis porrecta was first formally described in 1997 by David Jones, Brian Molloy and Mark Clements and the description was published in The Orchadian.[1] The specific epithet (porrecta) is a Latin word meaning "spread out" or "stretched.[4]

Distribution and habitat

The shrimp-flowered greenhood usually grows in deep shade in forest and scrub. There are scattered populations on both the North and South Islands.[2][3]

Conservation

Pterostylis porrecta is classed as "at risk - naturally uncommon" under the New Zealand Threat Classication System.[2][3][5]

References

  1. 1 2 "Pterostylis porrecta". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  2. 1 2 3 de Lange, Peter James. "Pterostylis porrecta". New Zealand Plant Conservation Network. Retrieved 5 July 2017.
  3. 1 2 3 "Pterostylis porrecta". New Zealand Native Orchid Group. Retrieved 5 July 2017.
  4. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 744.
  5. ↑ "New Zealand Threat Classification - Series 3" (PDF). Retrieved 5 July 2017.
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