Species

Juncus edgariae

Etymology

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

Common Name(s)

Wiwi, Edgars rush

Current Conservation Status

2012 - Not Threatened

Conservation status of New Zealand indigenous vascular plants, 2012
The conservation status of all known New Zealand vascular plant taxa at the rank of species and below were reassessed in 2012 using the New Zealand Threat Classification System (NZTCS). This report includes a statistical summary and brief notes on changes since 2009 and replaces all previous NZTCS lists for vascular plants. Authors: Peter J. de Lange, Jeremy R. Rolfe, Paul D. Champion, Shannel P. Courtney, Peter B. Heenan, John W. Barkla, Ewen K. Cameron, David A. Norton and Rodney A. Hitchmough. File size: 792KB

Previous Conservation Status

2009 - Not Threatened
2004 - Not Threatened

Authority

Juncus edgariae L.A.S.Johnson et K.L.Wilson

Family

Juncaceae

Flora Category

Vascular - Native

NVS Species Code

JUNEDG

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.

Structural Class

Rushes and Allied Plants

Synonyms

Juncus gregiflorus L.A.S.Johnson (now an Australian endemic)

Distribution

Endemic. Kermadec, North, South, Stewart and Chatham Islands. Naturalised in Britain

Habitat

Easily the most common indigenous species. Coastal to alpine (1600 m a.s.l.) but mainly coastal to montane. Usually in open shrubland, fringing wetlands, and in seasonally damp sites. Often found invading pasture and in urban areas.

Features

Bright to dark green, orange-green to red-green (drying glossy yellow-green) rather variable perennial forming compact to diffuse tussocks 0.6-2.5 m tall. Rhizome at or just below ground, 5 mm diameter, horizontal, difficult to pull from the soil. Flowering culms 1-3 mm diameter, erect, rather wiry (very hard when dry), smooth, shining; striations 22-60; internal culm pith interrupted irregularly or occasionally continuous; leaves absent; basal bracts dark red-brown below, straw-coloured above, tightly sheathing the stem or the upper-most loosely sheathing. Inflorescence apparently lateral, variable, either many or few-flowered, open with few to many branches bearing flowers in small clusters at the tips of branchlets, or condensed to a compact, central cluster with a few pedunculate side clusters, or a single spherical compact head wider than 10 mm. Flowers 1.5-2.0 mm long; tepals 6, brownish green, later becoming brown, acute to acuminate or mucronate; outer tepals 1.7-2.6 mm long, with fine hyaline margins, inner tepals slightly shorter with broad hyaline margins. Stamens 3, shorter than tepals; anthers 0.4-0.6 mm long < or equal in legnth to filaments. Capsule 1.5-2.3 mm long, equal to or < tepals, ellipsoid, obovoid, dark golden brown, with a dark brown, obtuse, almost retuse, apiculate tip. Seeds 0.4-0.6 mm long.

Similar Taxa

Distinguished from the other indigenous species with the flowers usually clustered at the branchlet apices, by the capsules 1.5-2.3 mm long. Moore & Edgar (1970) describe the stems of this species as bright green but in practice it is more usually dark green, orange-green or red-green, usually drying glossy yellow-green. Within the Central Volcanic Plateau of the North Island plants ascribed to this species often have extremely condensed, compact inflorescences. Of those species naturalised to New Zealand, J. edgariae is perhaps most similar to J. continuus L.A.S.Johnson, still a relatively uncommon species of mainly Northland habitats, and from which it differs by the usually interrupted (rarely continuous) bright white, dense stem pith and capsules < or more or less equal in length to the tepals. Long confused with Juncus gregiflorus L.A.S.Johnson which is now regarded as endemic to Australia (Johnson & Wilson 2000).

Flowering

October - December

Fruiting

November - April

Propagation Technique

Easy from fresh seed and by the division of whole plants. Can be invasive.

Threats

Not Threatened

Chromosome No.

2n = 40

Endemic Taxon

Yes

Endemic Genus

No

Endemic Family

No

Where To Buy

Occasionally available from retail plant and specialist native plant nurseries

Cultural Use/Importance

Plants referred to this species from the Central Volcanic Plateau and adjacent mountain ranges of the North Island have a densely clustered inflorescence, quite distinct from lowland forms and this is retained in cultivation. They may warrant taxonomic recognition.

Attribution

Fact Sheet prepared for NZPCN by P.J. de Lange (1 September 2006). Description based on Moore & Edgar (1970) (as J. gregiflorus) supplemented by notes taken from Johnson & Wilson (2000).

References and further reading

Johnson, L.A.S.; Wilson, K.L. 2000: Juncus edgariae (Juncaceae) - a new species from New Zealand. Telopea 9: 399-402,

Johnson, A. T. and Smith, H. A (1986). Plant Names Simplified: Their pronunciation, derivation and meaning. Landsman Bookshop Ltd: Buckenhill, UK.

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

This page last updated on 5 Jun 2014