red leek orchid
Genoplesium nudum (Hook.f.) D.L.Jones & M.A.Clem.; Prasophyllum nudum Hook.f.
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 threat classification 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. Authors: By 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. Please note, threat classifications are often suggested by authors when publications fall between NZTCS assessment periods – a suggested threat classification status has not been assessed by the NZTCS panel.
2017 | At Risk – Naturally Uncommon | Qualifiers: EF, SO, Sp
Previous conservation statuses
2012 | At Risk – Naturally Uncommon | Qualifiers: EF, SO, Sp
2009 | At Risk – Naturally Uncommon | Qualifiers: SO, EF
2004 | Sparse
Indigenous. North, South and Chatham Islands, from about Great Barrier Island and Albany south. Also present in Australia.
A species of mainly lowland to montane areas (1 - 900 m a.s.l.) favouring open shrublands including pakihi sites, skeletal soils over lying rock, peat bogs, and infertile clay bank scrub and road banks. It also grows in short grassland including pastures overlying sand, clay or gley podzols that are now dominated by introduced grasses.
Wetland plant indicator status rating
Information derived from the revised national wetland plant list prepared to assist councils in delineating and monitoring wetlands (Clarkson et al., 2021 Manaaki Whenua – Landcare Research Contract Report LC3975 for Hawke’s Bay Regional Council). The national plant list categorises plants by the extent to which they are found in wetlands and not ‘drylands’. The indicator status ratings are OBL (obligate wetland), FACW (facultative wetland), FAC (facultative), FACU (facultative upland), and UPL (obligate upland).
Commonly occurs as either a hydrophyte or non-hydrophyte (non-wetlands).
An erect, reed/rush-like reddish green orchid up to 500 mm tall of open or sparsely vegetated shrubland. Base of plant clad in persistent, brown, somewhat fibrous sheaths of old scale-leaves; these enclosing current tuber and remnant tubers of past seasons growth. Stem 1-3 mm diameter, dark green to red-green to reddish mottled, erect, rushlike, leafless almost up to inflorescence. Leaf very much < that inflorescence length; lamina inconspicuous, narrowly involute, shortly-sheathing. Inflorescence a raceme of 5-25 closely spaced flowers. Perianth dark red or reddish-green, narrow, horizontal, with a distinct knee projecting upwards. Dorsal sepal 2.5-3 mm, deeply concave, broadly ovate with a small apiculus; laterals definitely longer, very shortly fused (connate) at base, deeply concave, elliptic, tipped with a small spathulate, easily detached gland-like structure. Petals shorter, membranous, hair-tipped. Labellum just shorter than or equal to petals, dark red (rarely reddish-green), articulate by a narrow curved claw to long column-foot; limb broadly oblong, almost auriculate at base; callii 2, longitudinal, more or less parallel, finely and closely papillose; margins distinctly though finely ciliate, cilia usually red or red-green. Lateral processes of column as tall as anther; apices bfid with the anterior lobe more acute and very finely ciliolate. Anthers on a very short filament (almost sessile), overtopping rostellum, apiculate. Stigma about the same height as the column base.
Manaaki Whenua Online Interactive Key
Superficially similar to C. pumila (Hook.f.) D.L. Jones et M.A. Clem. from which it differs by its red-green to dark green (rather than yellow-green to green ) stem and leaf; much short leaf, horizontal rather than drooping, scarcely opening, reddish (rather than widely opening almost campanulate yellowish) flowers, and red rather than greenish labellum with finely ciliate margins.
December - August
January - November
Difficult - should not be removed from the wild
Apparently a naturally uncommon, biologically sparse species. However, as with G. pumila much of the habitat this species favours has been destroyed over the last 100 or so years and it is quite likely that this orchid has undergone a massive range reduction. Nevertheless probably because it has always been more wide ranging than G. pumila, it remains less threatened by continued development of lowland New Zealand. Despite this it is probably another species whose exact conservation status may require adjustment to take into account past habitat losses and continuing habitat modification. This is especially because much of its habitat remains unprotected and that which is, without periodic disturbance is likely to revert to taller vegetation unsuitable for this and other orchid species.
nuda: Nude or naked
Where To Buy
Not commercially available
Description adapted from: Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. II. Government Printer, Wellington.
Fact sheet prepared by P.J. de Lange for NZPCN (1 June 2013)
NZPCN Fact Sheet citation
Please cite as: de Lange, P.J. (Year at time of access): Corunastylis nuda Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/corunastylis-nuda/ (Date website was queried)