''Juncus planifolius'' is a species of rush, commonly known as broadleaf rush, broad-leaved rush, or grass-leaved rush. It naturally occurs in Australia,

New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only state ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the sout ...

. 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,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

planifolius Flora of Australia Flora of New Zealand Flora of South America Flora of Hawaii Plants described in 1810 {{Poales-stub