Vascular – Exotic
Rushes & Allied Plants
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.
Upright clump-forming leafless rush to 80 cm tall, with tall cylindrical stems, with tightly clustered spherical flowerheads near the end of each stem, made up of many red-brown flowers/capsules (fruit).
Tasman to Southland.
Lake margins, roadside drains and wet pasture.
Erect clumps; rhizomes short. Stems 30-80 cm × 1.5-3 mm, soft and easily split, grey-green, dull, prominently ridged especially just below inflorescence, pith continuous, cobwebby. Basal sheaths brownish-red, not shining. Inflorescence a ± spherical head c. 1 cm long, base of subtending floral bract conspicuously red-tinged and expanded to a wide opening through which inflorescence emerges. Flowers very crowded. Tepals 2-2.5 mm long, ± equal, acuminate. Stamens 3. Capsule c. 2 mm long, ± = tepals, ovoid-oblong, flattened at top, reddish-brown.
Similar to other tall leafless rushes, but has a dense single flower cluster, with an expanded floral bract behind it and conspicuous ridges on the stem beneath the inflorescence.
Spring to early summer
Summer to autumn
Seed dispersed by animals, water or contaminated machinery.
Europe, Western Asia Northwestern Africa and North America
Reason for introduction
Unknown, seed or soil contaminant.
Not controlled in New Zealand.
juncus: From the Latin jungere ‘to tie or bind’, the stems of some species being used to make cord (Johnson and Smith)
Notes on taxonomy
Subgenus Agathyron, Section Juncotypus (Genuini) Kirschner (2002: Juncaceae 3)
Factsheet prepared by Paul Champion and Deborah Hofstra (NIWA). Feature description from healy and Edgar (1980).
References and further reading
Healy, A.J.; Edgar, E. (1980). Flora of New Zealand, Volume III. Adventive Cyperaceous, Petalous and Spathaceous Monocotyledons. Government Printer, Wellington. 220pp.
Johnson PN, Brooke PA (1989). Wetland plants in New Zealand. DSIR Field Guide, DSIR Publishing, Wellington. 319pp.
Johnson, A. T. and Smith, H. A (1986). Plant Names Simplified: Their pronunciation, derivation and meaning. Landsman Bookshop Ltd: Buckenhill, UK.
Champion et al (2012). Freshwater Pests of New Zealand. NIWA publication. http://www.niwa.co.nz/freshwater-and-estuaries/management-tools/identification-guides-and-fact-sheets/freshwater-pest-species
Healy, A.J. (1982). Identification of weeds and clovers. New Zealand Weed and Pest Control Society Publication. Editorial Services Limited, Featherston. 299pp.
Kirschner, J. (compiler) (2002). Juncaceae 3: Juncus subg. Agathryon, Species Plantarum: Flora of the World Part 8: 1-192.