Juncus compressus

From Wikipedia, the free encyclopedia

Juncus compressus
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Juncaceae
Genus: Juncus
J. compressus
Binomial name
Juncus compressus
Jacq., 1762

Juncus compressus is a species of flowering plant in the rush family, Juncaceae.[1] It is native to temperate Eurasia.[1]Juncus compressus is easy to confuse with J. gerardii.


About 80 cm in height. Rhizomes are short-creeping or densely branching.  There are 1-3 cataphylls, and 1-2 leaves. The leaf blade is flat to slightly channeled, measuring 5–35 cm long and 0.8–2 mm wide. Inflorescences consist of 5-60 flowers. Flowers have six stamens, with filaments measuring 0.5-0.7 mm and anthers 0.6–1 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.[2]

Invasive species[edit]

The plant is considered an invasive species in the United States of America.[2]

US Spread
State/Province First Observed
IL 1982
IN 1987
MI 1980
NY 1895
WI 1974


  1. ^ a b "Juncus compressus Jacq". Plants of the World Online. Retrieved 8 January 2021.
  2. ^ a b Laboratory, NOAA Great Lakes Environmental Research. "NOAA National Center for Research on Aquatic Invasive Species (NCRAIS)". nas.er.usgs.gov. Retrieved 2022-06-14.