Juncus inflexus, the hard rush, is a species of flowering plant in the family Juncaceae, native to Europe, Asia and Africa, and introduced in Sri Lanka, Java, Île Amsterdam and Île Saint-Paul, Victoria in Australia, New Zealand, Uruguay, and eastern North America.

The stiff, glaucous stems are thin and wiry, measuring 1 – 2.5 mm in diameter.

They are lined with 15 – 20 distinct vertical ridges and filled with interrupted spongy pith.

[5] It blooms from late spring until midsummer, producing loose clusters of very small reddish-brown flowers at the top of some stems.

[6] Appears to be tolerant of annual mowing and light to moderate grazing.