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Juncus planifolius : ウィキペディア英語版 | Juncus planifolius
''Juncus planifolius'' is a species of rush, commonly known as grass-leaved rush or broad-leaf rush. It naturally occurs in Australia, New Zealand, Hawaii and South America. In New Zealand ''J. planifolius'' is found in open, wet ground, and can be typically found on exposed clay, beside tracks or drains.〔(【引用サイトリンク】url=http://www.nzpcn.org.nz/flora_details.asp?ID=2175 )〕 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.〔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 (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.〕 The species arrived in Ireland by 1973.〔Scannell, Mary J. P. 1973. Juncus planifolius R. Br. in Ireland. The Irish Naturalists’ Journal 17(9): 308-309.〕 It is now well established on Pacific coast of North America, where the plant was first collected in Oregon in 1980.〔Balslev Henrik, 1980. Juncus planifolius (Juncaceae) in North America. Brittonia, 32(1):51-54.〕 The first California record was in 2008,〔Zika PF, 2009. Noteworthy Collections. California. Madrono, 56:130.〕 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. ==References==
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