Kpdhage at 17:03, 30 November 2009

2009-11-30T17:03:36Z

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			Pterostylis (Greek, wing column; the column is broadly winged). Orchidaceae. Terrestrial herbs with small underground tubers: radical lvs. ovate; st.-lvs. developed and linear or lanceolate, or reduced to scarious sheathing scales: fls. usually green, often tinged red or brown, large and solitary or smaller and several in a raceme; dorsal sepal broad, erect, incurved and very concave; petals lanceolate-falcate, attached to the basal projection of the column; labellum on a short claw at the end of the basal projection of the column, movable; column with a pair of hatchet-shaped or quadrangular wings.—About 50 species, mostly Australian but a few in New Zeal, and New Caledonia and 1 in New Guinea. P. curta, R. Br. Lvs. in a radical rosette, usually on long petioles, ovate or broadly elliptical, 5-9-nerved: scapes 1-fld.; usually about 6 in. high; galea erect, acute; lip linear, obtuse, entire, rather longer than the column; wings of the column with the lower lobe long and obtuse, the upper lobe short and broad. Austral. B.M. 3086. O. 1910:104. Cult, to some extent in greenhouses abroad as are the following: P. acuminata, R. Br. Austral. B.M. 3401; P. Banksii, R. Br. New Zeal. B.M. 3172; P. Baptistii, Fitzg. Austral. B.M. 6351; and P. nutans, R. Br. Austral. B.M. 3085. They are prop, by division and thrive in lf .-mold lightened by a little sand; the lower third of the pots should be filled with broken crocks.

			F. Tracy Hubbard.
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	{{Taxobox		{{Taxobox
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MediaWiki default at 09:44, 23 July 2007

2007-07-23T09:44:02Z

New page

{{Taxobox
| color = lightgreen
| name = Greenhood
| image = Pterostylis coccinea 270903.jpg
| image_width = 250px
| image_caption = ''Pterostylis coccinea''
| regnum = [[Plant]]ae
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Monocotyledon|Liliopsida]]
| ordo = [[Asparagales]]
| familia = [[Orchidaceae]]
| tribus = [[Diurideae]]
| subtribus = [[Pterostylidinae]]
| genus = '''''Pterostylis'''''
| genus_authority = [[Robert Brown (botanist)|R.Br., 1810]]
| type_species = ''Pterostylis curta''
| subdivision_ranks = Species
| subdivision = See text.
}}
[[Image:Pterostylis coccinea 051002a.jpg|thumb|right|200px|''Pterostylis coccinea'', sepals and petals removed<br />(1) - Lip<br />(2) - Hinge<br />(3) - stigma<br />(4) - pollinia]]
'''Pterostylis''' is a [[terrestrial plant|terrestrial]] deciduous genus of some 100 or so species of orchids found mainly in [[New Zealand]], [[Australia]], [[Papua New Guinea]] and [[New Caledonia]]. The common name of this orchid is '''Greenhood''' - a number of species have green flowers with the [[orchid flower|dorsal sepal]] forming a "hood" over the rest of the flower. The name ''Pterostylis'' is based on the Greek words meaning winged column (''pteron'' - a wing, ''stylis'' - a [[column (botany)| column]]). In a number of species, the flower has a hinged [[labellum|lip]] that swings backwards when touched by an insect, forming a tube with the [[column (botany)|column]] and wings. The trapped insect is then forced to crawl out of the tube, removing the [[pollinia]] in the process.

==Species==
* ''[[Pterostylis acuminata]]''
* ''[[Pterostylis agathicola]]''
* ''[[Pterostylis alveata]]''
* ''[[Pterostylis alobula]]''
* ''[[Pterostylis areolata]]''
* ''[[Pterostylis auriculata]]''
* ''[[Pterostylis australis]]''
* ''[[Pterostylis banksii]]''
** var. ''banksii''
** var. ''silvicultrix''
* ''[[Pterostylis barbata]]''
* ''[[Pterostylis basaltica]]''
* ''[[Pterostylis brumalis]]''
* ''[[Pterostylis caulescens]]''
* ''[[Pterostylis cardiostigma]]''
* ''[[Pterostylis cernua]]''
* ''[[Pterostylis collina]]''
* ''[[Pterostylis concinna]]''
* ''[[Pterostylis cucullata]]''
* ''[[Pterostylis curta]]''
* ''[[Pterostylis cycnocphala]]''
* ''[[Pterostylis despectans]]''
* ''[[Pterostylis foliata]]''
* ''[[Pterostylis gibbosa]]''
* ''[[Pterostylis graminea]]''
* ''[[Pterostylis grandiflora]]''
* ''[[Pterostylis humilis]]''
* ''[[Pterostylis irsoniana]]''
* ''[[Pterostylis irwinii]]''
* ''[[Pterostylis micromega]]''
* ''[[Pterostylis montana]]''
** var. ''montana''
** var. ''rubricaulis''
* ''[[Pterostylis mutica]]''
* ''[[Pterostylis nana]]''
* ''[[Pterostylis nutans]]''
* ''[[Pterostylis oliveri]]''
* ''[[Pterostylis ophioglossa]]''
* ''[[Pterostylis papuana]]''
* ''[[Pterostylis parviflora]]''
* ''[[Pterostylis patens]]''
* ''[[Pterostylis paludosa]]''
* ''[[Pterostylis plumosa]]''
* ''[[Pterostylis porrecta]]''
* ''[[Pterostylis praetermissa]]''
* ''[[Pterostylis puberula]]''
* ''[[Pterostylis reflexa]]''
* ''[[Pterostylis revoluta]]''
* ''[[Pterostylis rufa]]''
* ''[[Pterostylis sanguinea]]''
* ''[[Pterostylis saxicola]]''
* ''[[Pterostylis tanypoda]]''
* ''[[Pterostylis tasmanica]]''
* ''[[Pterostylis tristis]]''
* ''[[Pterostylis trullifolia]]''
** var. ''gracillis''
** var. ''trullifolia''
* ''[[Pterostylis venosa]]''
* ''[[Pterostylis woolsii]]''

==References==
Flora of New Zealand, Volume II

[[Category:Orchids of Australia]]
[[Category:Orchids of New Zealand]]
[[Category:Orchid genera]]

Pterostylis - Revision history

Kpdhage at 17:03, 30 November 2009

MediaWiki default at 09:44, 23 July 2007