Juncus biflorus

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Common names: Two-flowered rush, Bog rush, Large Grass-leaved Rush[1]

Juncus biflorus
Juncus biflorus AVF.JPG
Photo by Gary Fleming at the Digital Atlas of the Virginia Flora
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Moncots
Order: Juncales
Family: Juncaceae
Genus: Juncus
Species: J. biflorus
Binomial name
Juncus biflorus
Natural range of Juncus biflorus from USDA NRCS Plants Database.

Taxonomic Notes

Synonyms: Juncus marginatus Rostkovius, Juncus aristulatus Michaux var. biflorus (Elliott) Small.[1]

Varieties: none.[1]


Also known as bog rush, J. biflorus is a native perennial graminoid that is a member of the Juncaceae family. It has a rapid rhizomatous growth form reaching a mature height of 3.5 feet.[2]


J. biflorus can be found in the Southeastern United States from Mississippi and up to Michigan as well as along the Atlantic coast to New Jersey.[2]



The main communities J. biflorus can be found include pine savannahs, pine flatwoods, mesic portions of sandhill-pocosin ecotones, and even roadsides, wet meadows, interdune swales, tidal marshes, and ditches.[3] As well, J. biflorus has been observed on the margin of an old wet fireland, margin of wet woods, and in a flooded depression.[4]


Blooming occurs June through October.[1]

Conservation, cultivation, and restoration

J. biflorus is listed as endangered in the state of New York, and is listed as threatened in the state of Pennsylvania.[2]

Cultural use

Photo Gallery

References and notes

  1. 1.0 1.1 1.2 1.3 Weakley, A.S. 2015. Flora of the southern and mid-atlantic states. Working Draft of 21 May 2015. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
  2. 2.0 2.1 2.2 USDA Plants Database URL: https://plants.usda.gov/core/profile?symbol=JUBI
  3. Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
  4. Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2018. Collectors: John B. Nelson, Wade Biltoft, Keith Bradley, Daniel Castillo, and Richard D. Porcher. States and counties: South Carolina: Berkely and Orangeburg.