Pterostylis vittata

Pterostylis vittata, commonly known as the banded greenhood[3] or green-banded greenhood,[4] is a plant in the orchid family Orchidaceae and is endemic to the south-west of Western Australia. The plants either have a rosette of leaves on a short stalk in the years when not flowering or stem leaves on a flowering spike. When flowering, it has up to about twenty five flowers which are translucent green with darker green stripes. It was formerly thought to occur in South Australia and Victoria but those collections are now thought to be of Pterostylis sanguinea.

Banded greenhood
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Orchidoideae
Tribe: Cranichideae
Genus: Pterostylis
Species:
P. vittata
Binomial name
Pterostylis vittata
Synonyms[2]

Description

Pterostylis vittata, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of between three and seven leaves, each leaf 10–30 mm (0.4–1 in) long and 5–18 mm (0.2–0.7 in) wide, the rosette on a stalk 20–60 mm (0.8–2 in) long. When flowering, there are up to twenty five transparent green flowers with darker green bands borne on a flowering spike 200–450 mm (8–20 in) high. The flowering spike has between three and fourteen stem leaves which are 20–50 mm (0.8–2 in) long and 4–7 mm (0.2–0.3 in) wide. The flowers are 12–15 mm (0.5–0.6 in) long, 8–10 mm (0.3–0.4 in) wide. The dorsal sepal and petals form a hood or "galea" over the column. The lateral sepals turn downwards, are 9–10 mm (0.35–0.39 in) long, 8–9 mm (0.3–0.4 in) wide and joined at their bases. The labellum is green, hairy and insect-like, about 4 mm (0.2 in) long and 3 mm (0.1 in) wide and flicks upwards when touched. Flowering occurs from May to September.[3][4][5][6]

Taxonomy and naming

Pterostylis vittata was first formally described in 1840 by John Lindley and the description was published in A Sketch of the Vegetation of the Swan River Colony.[1] The specific epithet (vittata) is a Latin word meaning "striped" or "banded",[7] referring to the striped galea.[3]

Distribution and habitat

The banded greenhood occurs to the south of Perth and as far east as Balladonia, growing in forest, woodland and heath, although more often on granite outcrops in the east of its range.[4][3][5][8] It was previously thought to occur in South Australia, Victoria and Tasmania, but those collections are now thought to be of P. sanguinea.[9][10]

Conservation

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

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References
  1. "Pterostylis vittata". APNI. Retrieved 31 May 2017.
  2. "Pterostylis vittata". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew.
  3. Brown, Andrew; Dundas, Pat; Dixon, Kingsley; Hopper, Stephen (2008). Orchids of Western Australia. Crawley, Western Australia: University of Western Australia Press. p. 387. ISBN 9780980296457.
  4. Jones, David L. (2006). A complete guide to native orchids of Australia including the island territories. Frenchs Forest, N.S.W.: New Holland. p. 339. ISBN 978-1877069123.
  5. Hoffman, Noel; Brown, Andrew (2011). Orchids of South-West Australia (3rd ed.). Gooseberry Hill: Noel Hoffman. p. 426. ISBN 9780646562322.
  6. Archer, William (2008-07-24). "Banded greenhood - Pterostylis vittata". Esperance Wildflowers. Retrieved 31 May 2017.
  7. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.page =660: Smithsonian Institution Press.CS1 maint: location (link)
  8. "Pterostylis vittata". FloraBase. Western Australian Government Department of Parks and Wildlife.
  9. Jones, David L. (1998). "Contributions to Tasmanian Orchidology". Australian Orchid Research. 3: 151.
  10. "Pterostylis vittata". Royal Botanic Garden Melbourne; vicflora. Retrieved 31 May 2017.
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