None (first described in 1950)
Vascular – Native
The National Vegetation Survey (NVS) Databank is a physical archive and electronic databank containing records of over 94,000 vegetation survey plots - including data from over 19,000 permanent plots. NVS maintains a standard set of species code abbreviations that correspond to standard scientific plant names from the Ngä Tipu o Aotearoa - New Zealand Plants database.
2n = 44
Current conservation status
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2017 using the New Zealand Threat Classification System (NZTCS) – more information about this can be found on the NZTCS website. This report includes a statistical summary and brief notes on changes since 2012 and replaces all previous NZTCS lists for vascular plants.
Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – an interim threat classification status has not been assessed by the NZTCS panel.
- Conservation status of New Zealand indigenous vascular plants, 2017 . 2018. Peter J. de Lange, Jeremy R. Rolfe, John W. Barkla, Shannel P. Courtney, Paul D. Champion, Leon R. Perrie, Sarah M. Beadel, Kerry A. Ford, Ilse Breitwieser, Ines Schönberger, Rowan Hindmarsh-Walls, Peter B. Heenan and Kate Ladley. Department of Conservation. Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.
2017 | Not Threatened
Previous conservation statuses
2012 | Not Threatened
2009 | Not Threatened
2004 | Not Threatened
Endemic. North and South Islands, from East Cape South to Wellington, then mainly in the West of the South Island to about Haast.
Lowland to subalpine (montane to subalpine in the northern part of range) up to 1200 m a.s.l. In beech (Nothofagus Blume) forest, Podocarp forest, frost flats and subalpine scrub. Often in deep drifts of leaf litter or on the margins of sphagnum bogs.
Terrestrial, summer-green, tuberous perennial herb. Plants solitary or in colonies, up to 350 mm tall when flowering. Stem stout, erect, terete, smooth, internodes < to
Manaaki Whenua Online Interactive Key
The distinctive curled labellum with an deeply emarginate tip (like a drainers scoop), and prominent dark medial basal callus facing the column are key distinctions that separate this species for all other Pterostylis in New Zealand. The flowers are usually dark green tinged with red.
October - January
December - April
Difficult - should not be removed from the wild. asic orchid mix consists of 2 parts medium coarse sand, ideally clean river sand; 2 parts soil, humus or leaf-mould; 1 part weathered sawdust or rotting wood; 1 part granulated bark. For Pterostylis shade of 50% and pots kept evenly moist.
pterostylis: Winged column
Where To Buy
Not commercially available
Fact Sheet prepared for NZPCN by P.J. de Lange 14 April 2007: Description adapted from Moore and Edgar (1970).
References and further reading
Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. II. Government Printer, Wellington.
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Pterostylis irsoniana Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/pterostylis-irsoniana/ (Date website was queried)