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  4. Juncus caespiticius

Juncus caespiticius

Whitiau Scenic Reserve. Dec 1992.<br>Photographer: Colin C. Ogle, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by-nc/4.0'>CC BY-NC</a>.
Herbarium specimen: AK 289026. Photographed with permission of Auckland Institute and Museum.<br>Photographer: Jeremy R. Rolfe, Date taken: 23/10/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Herbarium specimen: AK 289026. Photographed with permission of Auckland Institute and Museum.<br>Photographer: Jeremy R. Rolfe, Date taken: 23/10/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Herbarium specimen: AK 289026. Photographed with permission of Auckland Institute and Museum.<br>Photographer: Jeremy R. Rolfe, Date taken: 23/10/2007, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Jackson Head.<br>Photographer: Mike Thorsen, Date taken: 11/08/2013, Licence: All rights reserved. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Putangirua Stream, Palliser Bay.<br>Photographer: Jeremy R. Rolfe, Date taken: 20/02/2010, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
Putangirua Stream, Palliser Bay.<br>Photographer: Jeremy R. Rolfe, Date taken: 20/02/2010, Licence: <a target='_blank' href='https://creativecommons.org/licenses/by/4.0'>CC BY</a>. <a class='member-message' href='/nzpcn/why-join-nzpcn/' target='_blank'>Members can view a larger version of this image.</a>
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Synonyms

None

Family

Juncaceae

Authority

Juncus caespiticius Meyer in Lehm.

Flora category

Vascular – Native

Endemic taxon

No

Endemic genus

No

Endemic family

No

Structural class

Rushes & Allied Plants

NVS code

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.

JUNCAE

Current conservation status

  • Conservation status of New Zealand indigenous vascular plants, 2017

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.

Source: NZTCS and licensed by DOC for reuse under the Creative Commons Attribution 4.0 International licence.

2018 | At Risk – Declining

Previous conservation statuses

2017 | At Risk – Declining | Qualifiers: DP, SO

2012 | Not Threatened

2009 | Not Threatened

2004 | Not Threatened

Distribution

Indigenous. North and South Islands. Present in Australia

Habitat

Usually coastal. Growing in or near damp seepages, or on steep, damp cliff faces festooned with Blechnum blechnoides (Bory) Keyserl., Sonchus kirkii Hamlin, Machantia macropora Mitt. and Nostoc. Very rarely in dune swales or around the margins of brackish lagoons and streams. Also recorded on rock bluffs up to 500 m a.s.l.

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).

OBL: Obligate Wetland

Almost always is a hydrophyte, rarely in uplands (non-wetlands).

Features

Tufted, dark green to red-green perennial forming circular patches up to 100 mm diameter. Stems 80-450 x 1-2 mm. Leaves numerous, all basal, grass-like, > inflorescence. Flowers 3 mm long; outer tepals acute or acuminate, shorter than the inner, more membranous, subobtuse tepals. Stamens 6. Capsule more or less equal in length to tepals, obtuse, mucronate.

Similar taxa

Distinguished from J. planifolius R.Br., J. lomatophyllus Spreng., and J. dregeanus Kunth by the inflorescence which is usually a single, globose head, and by the broadly channelled leaves. Over the last 20 or so years a very similar, bright green to yellow green-leaved rush with dark black globose inflorescences has colonised the west coast of the North Island, initially around the Waitakere Coast but now known as far north as Hokianga and possibly as far south as Wanganui. This rush appears to be Australian, although as yet not one has determined which species it is. It is widely known as J. aff. caespiticius or J. aff. dregeanus.

Flowering

September - January

Fruiting

October - July

Life cycle

Mucilaginous seeds are dispersed by attachment, wind and water (Thorsen et al., 2009).

Propagation technique

Easily grown from fresh seed. An interesting pot plant or species for a damp place within a rockery. Has considerable horticultural potential.

Threats

Not Threatened but now declining or extinct north of the Waikato.

Etymology

juncus: From the Latin jungere ‘to tie or bind’, the stems of some species being used to make cord (Johnson and Smith)

caespiticius: From the Latin caespes ‘tuft’ or ‘sod of turf’, meaning made of turf or turf-like

Where To Buy

Not commercially available

Attribution

Fact Sheet prepared for NZPCN by P.J. de Lange (1 September 2006). Description based on Moore & Edgar (1970).

References and further reading

Moore, L.B.; Edgar, E. 1970: Flora of New Zealand. Vol. I. Government Printer, Wellington.

Thorsen, M. J.; Dickinson, K. J. M.; Seddon, P. J. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285-309

NZPCN Fact Sheet citation

Please cite as: de Lange, P.J. (Year at time of access): Juncus caespiticius Fact Sheet (content continuously updated). New Zealand Plant Conservation Network. https://www.nzpcn.org.nz/flora/species/juncus-caespiticius/ (Date website was queried)

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