This rush species with a European-Caucasian distribution is present in all regions of Italy. It grows in bogs and fens, on neutral-basic, muddy soils, from sea level to about 1000 m. The species is sporadic on the edge of the Sardinian temporary ponds. The genus name, from the Latin 'iúngere' (to join, to tie), refers to the ancient use of weaving the stems and leaves of rush species to create different objects; the species name refers to the leaves divided into joins by cross-septa, which feel knotty to the touch. Flowering period: June to August.

Italian name(s): Giunco subnodoso (Italia).