Pterostylis viriosa

Short description: Species of orchid

Adelaide Hills banded greenhood

Scientific classification
Kingdom:  | Plantae
Clade:  | Tracheophytes
Clade:  | Angiosperms
Clade:  | Monocots
Order:  | Asparagales
Family:  | Orchidaceae
Subfamily:  | Orchidoideae
Tribe:  | Cranichideae
Genus:  | Pterostylis
Species:  |

P. viriosa

Binomial name
Pterostylis viriosa

(D.L.Jones) R.J.Bates<

Synonyms[1]

Bunochilus viriosus D.L.Jones

Pterostylis viriosa, commonly known as the Adelaide Hills banded greenhood, is a plant in the orchid family Orchidaceae and is endemic to South Australia. Flowering plants have up several green flowers with faint white stripes. The flowers have an insect-like labellum which is green with a dark green mound on its upper end. Non-flowering plants have a rosette of leaves on a stalk, but flowering plants lack the rosette, instead having several stem leaves.

## Contents

* 1 Description
* 2 Taxonomy and naming
* 3 Distribution
* 4 References

## Description

Pterostylis viriosa, is a terrestrial, perennial, deciduous, herb with an underground tuber. Non-flowering plants have a rosette of leaves on a short stalk. Flowering plants have up to several green flowers with faint white stripes on a flowering spike up to 800 mm (30 in) high. The flowering spike lacks a rosett but has a small number of stem leaves. The dorsal sepal and petals are fused, forming a hood or "galea" over the column. The petals have a wide, transparent flange on their outer edges. The lateral sepals turn downwards and are joined for most of their length before tapering to triangular tips. The labellum is insect-like and hairy with a dark green mound on the "head" end and a dark green mid-line. Flowering occurs from late July to early September.[2][3]

## Taxonomy and naming

This greenhood was first formally described in 2006 by David Jones and given the name Bunochilus viriosus. The description was published in Australian Orchid Research from a specimen collected in the Belair National Park.[4] In 2008 Robert Bates changed the name to Pterostylis viriosa.[5] The specific epithet (viriosa) is a Latin word meaning "robust" or "strong",[6] referring to the robust nature of this orchid and to its large flowers.[3]

## Distribution

The Adelaide Hills banded greenhood occurs in the Fleurieu (KAN02), Mount Lofty Ranges (FLB01), Central Flinders (FLB06) and Talia (EYB04) biogeographic regions of South Australia.[7]

## References

1. ↑ "Pterostylis viriosa". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew. http://wcsp.science.kew.org/namedetail.do?name_id=373691.
2. ↑ "Common native orchids of the Adelaide Hills". Government of South Australia Department of Environment, Water and Natural Resources. http://www.naturalresources.sa.gov.au/files/sharedassets/adelaide_and_mt_lofty_ranges/nrm_education/amlr-native-orchids-2015-gen.pdf. Retrieved 23 July 2017.
3. ↑ 3.0 3.1 Jones, David L. (2006). "New taxa of Australasian Orchidaceae". Australian Orchid Research 5: 129–130.
4. ↑ "Bunochilus viriosus". APNI. https://id.biodiversity.org.au/instance/apni/615279. Retrieved 23 July 2017.
5. ↑ "Pterostylis viriosa". APNI. https://id.biodiversity.org.au/instance/apni/641268. Retrieved 23 July 2017.
6. ↑ Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 766.
7. ↑ "Pterostylis viriosa (Orchidaceae)". Government of South Australia Department of Environment, Water and Natural Resources. http://saseedbank.com.au/species_information.php?rid=3632. Retrieved 23 July 2017.

Wikidata ☰ Q15492203 entry

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