Global invasive species database

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Common name
field rush (English), slender rush (English), poverty rush (English), path rush (English), bull grass (English), slender yard rush (English), wiregrass (English), soft rush (English), jonc grĂȘle (French)
Synonym
Juncus macer , S.F. Gray
Juncus tenuis , var. anthelatus Wieg.
Juncus tenuis , var. multicornis E. Mey.
Juncus tenuis , var. williamsii Fern.
Similar species
Summary
Juncus tenuis is a rush introduced to countries worldwide. It may affect native species through competition with other plants and the alteration of valuable native habitats. For example, in Saint Helena J. tenuis reduces the suitability of nesting sites for the 'Critically Endangered (CR)' endemic wirebird Charadrius sanctaehelenae.
Species Description
Juncus tenuis is a perennial herb; stems 1 to 6 dm long, 1 to 2 mm in diameter, loosely cespitose. Leaves basal, numerous and crowded, blades variable in length, 7 to 30 cm long, 1 to 1.3 mm wide, sheaths loose with wide hyaline margins prolonged into white scarious auricles up to 5 mm long. Flowers (3-) numerous, borne singly on 1 side of rachis, in relatively compact dichasial cymes 1 to 7 cm long, forming less than 1/3 of plant, bracts 2 to 3, foliaceous, usually far exceeding inflorescence, each flower subtended by 2 bracteoles, these hyaline, triangular-ovate; perianth parts greenish, lanceolate, 3 to 4.5 mm long, apex long-acuminate, outer ones slightly reflexed at apex, inner ones with wide hyaline margins below; stamens 6, 1/2 as long as perianth; anthers shorter than filaments. Capsules reddish brown, 1-celled, broadly ovoid, thin-walled, slightly beaked, 2/3 to rarely scarcely shorter than perianth. Seeds pale brown, oblong, 0.3 to 0.4 mm long, slightly apiculate at both ends (Wagner et al. 1999, in PIER 2007).
Habitat Description
Juncus tenuis is found naturalised in Hawaii usually in wet sites along trails, disturbed places, and pastures at altitudes of 700 to 2000 meters (Wagner et al. 1999, in PIER 2007).

Principal source:

Compiler: IUCN SSC Invasive Species Specialist Group (ISSG) with support from the EU-funded South Atlantic Invasive Species project, coordinated by the Royal Society for the Protection of Birds (RSPB)

Review:

Publication date: 2010-08-16

Recommended citation: Global Invasive Species Database (2018) Species profile: Juncus tenuis. Downloaded from http://www.iucngisd.org/gisd/species.php?sc=1449 on 13-12-2018.

General Impacts
The Global Compendium of Weeds lists Juncus tenuis as an agricultural weed, casual alien, cultivation escape and environmental weed (GCW 2007).
J. tenuis has proven to be an ecological weed on Saint Helena where it alters valuable native habitats including breeding and nesting sites of the 'Critically Endangered (CR)' endemic wirebird (see Charadrius sanctaehelenae in IUCN Red List of Threatened Species) (Varnham 2006).
Countries (or multi-country features) with distribution records for Juncus tenuis
NATIVE RANGE
  • bolivia
  • brazil
  • canada
  • colombia
  • costa rica
  • ecuador
  • guatemala
  • honduras
  • jamaica
  • mexico
  • peru
  • puerto rico
  • united states
Informations on Juncus tenuis has been recorded for the following locations. Click on the name for additional informations.
Lorem Ipsum
Location Status Invasiveness Occurrence Source
Details of Juncus tenuis in information
Status
Invasiveness
Arrival date
Occurrence
Source
Introduction
Species notes for this location
Location note
Management notes for this location
Impact
Mechanism:
Outcome:
Ecosystem services:
Impact information
The Global Compendium of Weeds lists Juncus tenuis as an agricultural weed, casual alien, cultivation escape and environmental weed (GCW 2007).
J. tenuis has proven to be an ecological weed on Saint Helena where it alters valuable native habitats including breeding and nesting sites of the 'Critically Endangered (CR)' endemic wirebird (see Charadrius sanctaehelenae in IUCN Red List of Threatened Species) (Varnham 2006).
Red List assessed species 1: CR = 1;
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Locations
SAINT HELENA
Outcomes
[2] Environmental Ecosystem - Habitat
  • [1] Reduction in native biodiversity
  • [1] Habitat degradation
Management information
Bibliography
8 references found for Juncus tenuis

Managment information
Global Compendium of Weeds (GCW). 2007. Juncus tenuis (Juncaceae)
Summary: Available from: http://www.hear.org/gcw/species/juncus_tenuis/ [Accessed 14 August 2008]
IUCN/SSC Invasive Species Specialist Group (ISSG)., 2010. A Compilation of Information Sources for Conservation Managers.
Summary: This compilation of information sources can be sorted on keywords for example: Baits & Lures, Non Target Species, Eradication, Monitoring, Risk Assessment, Weeds, Herbicides etc. This compilation is at present in Excel format, this will be web-enabled as a searchable database shortly. This version of the database has been developed by the IUCN SSC ISSG as part of an Overseas Territories Environmental Programme funded project XOT603 in partnership with the Cayman Islands Government - Department of Environment. The compilation is a work under progress, the ISSG will manage, maintain and enhance the database with current and newly published information, reports, journal articles etc.
McCulloch, Neil and Ken Norris. 2001. Diagnosing the Cause of Population Changes: Localized Habitat Change and the Decline of the Endangered St Helena Wirebird, The Journal of Applied Ecology 38 (40): 771-783.
Varnham, K. 2006. Non-native species in UK Overseas Territories: a review. JNCC Report 372. Peterborough: United Kingdom.
Summary: This database compiles information on alien species from British Overseas Territories.
Available from: http://www.jncc.gov.uk/page-3660 [Accessed 10 November 2009]
General information
ITIS (Integrated Taxonomic Information System), 2008. Online Database Juncus tenuis Willd.
Summary: An online database that provides taxonomic information, common names, synonyms and geographical jurisdiction of a species. In addition links are provided to retrieve biological records and collection information from the Global Biodiversity Information Facility (GBIF) Data Portal and bioscience articles from BioOne journals.
Available from: http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=39243 [Accessed 10 November 2008]
Pacific Island Ecosystems at Risk (PIER). 2007. Juncus tenuis Willd., Juncaceae
Summary: Available from: http://www.hear.org/pier/species/juncus_tenuis.htm [Accessed 10 December 2008]
United States Department of Agriculture - Natural Resources Conservation Service (USDA-NRCS). 2008. Juncus tenuis Willd.
Summary: Available from: http://plants.usda.gov/java/profile?symbol=JUTE [Accessed 14 August 2008]
Contact
The following 0 contacts offer information an advice on Juncus tenuis