Juncus compressus, the round fruited rush, is a species of flowering plant in the rush family, Juncaceae. It is native to temperate Eurasia.Juncus compressus is easy to confuse with J. gerardii.
About 80 cm in height. Rhizomes are short-creeping or densely branching.àThere are 1-3 cataphylls, and 1-2 leaves. The leaf blade is flat to slightly channeled, measuring 5âÂÂ35 cm long and 0.8âÂÂ2 mm wide. Inflorescences consist of 5-60 flowers. Flowers have six stamens, with filaments measuring 0.5-0.7 mm and anthers 0.6âÂÂ1 mm. Seed capsules are brown.
Juncus compressus prefers calcareous wetlands and is often associated with disturbed habitats, such as ditches, roadsides, railroads, and canal banks.
The plant is considered an invasive species in the United States of America.