Juncus triglumis, called the three-flowered rush, is a species of flowering plant in the genus Juncus, native to the subarctic and subalpine Northern Hemisphere.

[2][3] It is typically found in calcareous tundra habitats and arcto-alpine fens.

[4] It is often found in association with Carex atrofusca and Carex bicolor in the so-called Caricion bicolori-atrofuscae alliance.

[5] The following subspecies are currently accepted:[2]

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