In New Zealand J. planifolius is found in open, wet ground, and can be typically found on exposed clay, beside tracks or drains.
Recently J. planifolius has been introduced to the northern hemisphere. It was found in Hawai'i in 1930 and has spread to most of the islands. The species arrived in Ireland by 1973. It is now well established on Pacific coast of North America, where the plant was first collected in Oregon in 1980. The first California record was in 2008, but populations were probably well established before then. Juncus planifolius may have arrived as a contaminant in vines planted in commercial cranberry bogs, but is now spreading in native coastal bogs, where it may displace native plants.
In North America, it is recognized by its unbranched stems, basal leaves with no sharp demarcation of sheath and blade, and blackish tepals.
- "Juncus planifolius". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 22 January 2016.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "Juncus planifolius". New Zealand Plant Conservation Network. Retrieved 2 October 2012.
- Wester L, 1992. Origin and distribution of adventives alien flowering plants in Hawai'i. In: Alien plant invasions in native ecosystems of Hawaii: Management and research [ed. by Stone, C. P. \Smith, C. W. \Tunison, J. T.]. Honolulu, Hawaii, USA: University of Hawaii Cooperative National Park Resources Studies Unit, 99-154 pp.
- Scannell, Mary J. P. 1973. Juncus planifolius R. Br. in Ireland. The Irish Naturalists’ Journal 17(9): 308-309.
- Balslev Henrik, 1980. Juncus planifolius (Juncaceae) in North America. Brittonia, 32(1):51-54.
- Zika PF, 2009. Noteworthy Collections. California. Madrono, 56:130.
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