• NSF NEON | Open Data to Understand our Ecosystems
  • Biorepository Data Portal

  • Home
  • Search
    • Sample search
    • Map search
    • Dynamic Species List
    • Taxonomic Explorer
  • Images
    • Image Browser
    • Image Search
  • Datasets
    • Research Datasets and Special Collections
    • Carabidae Checklists with Keys
    • Mosquito Checklists with Keys
    • Checklist: Research Sites - Invertebrates
    • Checklist: Research Sites - Plants
    • Checklist: Research Sites - Vertebrates
  • Sample Use
    • Sample Use Policy
    • Sample Request
    • Sample Archival Request
    • Dataset Publishing
  • How to Cite
  • Additional Information
    • Tutorials and Help
    • Biorepository Staff
    • About NEON
    • NEON Data Portal
    • ASU Biocollections
    • About Symbiota
  • Getting Started
Login New Account Sitemap
Juncus cooperi Engelm.  

No occurrences found

Family: Juncaceae
Cooper's rush
Juncus cooperi image
Max Licher
  • FNA
  • Field Guide
  • Resources
Ralph E. Brooks*;Steven E. Clemants*;  in Flora of North America (vol. 22)
Herbs, perennial, robust, tufted, 4--10 dm. Rhizomes short. Culms terete, 1.5--2.5 mm diam. Cataphylls several, reddish brown, often apiculate. Leaves basal, 1--2; auricles essentially absent; blade terete, 10--40 dcm, shorter than culm. Inflorescences glomerules 3--12, each with (1--)2--5 flowers, open, branches unequal, 3--12 cm, primary bract terete or slightly compressed, shorter to longer than inflorescence. Flowers: tepals straw-colored to pale green, ovate-lanceolate, 4--5 mm, apex acuminate or setaceous; inner series elliptic, nearly equal, margins wide, scarious, apiculate; stamens 6, filaments 1 mm, anthers 1.5--2 mm; style 1 mm. Capsules tan to light reddish brown, 3-locular, ellipsoid, 3.7--4.5 x1.6--2 mm, mostly shorter than or nearly equal to perianth. Seeds dark amber, obovoid, body 0.7--1 mm, tails 0.1--0.5 mm. Flowering and fruiting spring--summer. Saline flats and meadows or edges of salt marshes; below 600 m; Ariz., Calif., Nev., Utah; Mexico.
FNA 2000, Kearney and Peebles 1969, Wiggins 1964
Common Name: Cooper's rush Duration: Perennial Nativity: Native Lifeform: Graminoid General: Robust tufted perennial herb with short rhizomes, 40-100 cm tall. Vegetative: Culms terete, 1.5-2.5 mm in diameter, with several reddish brown cataphylls that are often apiculate, 1-2 basal leaves, no real auricles; light green blade stiff, spinescent, terete, 10-40 cm, shorter than stem. Inflorescence: Compound panicle of glomerules 3-12, each with 2-5 flowers, open with unequal branches, 3-12 cm; the primary bract terete or slightly compressed, shorter to longer than inflorescence; tepals straw-colored to pale green, ovate-lanceolate, 4-5 mm, apex acuminate or setaceous; inner series elliptic, nearly equal, margins wide, scarious, apiculate; 6 stamens, the filaments 1 mm, anthers 1.5-2 mm, and style 1 mm; capsules tan to light reddish brown, 3-locular, ellipsoid, 3.5-4.5 mm long by 1.5-2 mm wide. Ecology: Found in saline flats, and along the edges of meadows and salt marshes below 2,000 ft (610 m); flowers May-September. Notes: Distinguished by its habitat and by the acute perianth segments which are narrowly scarious margined, greenish or straw colored, and 4-6 mm long, which equal the capsule generally. Ethnobotany: Unknown Etymology: Juncus comes from the Latin jungere, to join or bind, while cooperi is named for Dr. James Graham Cooper (1830-1902) a geologist. Synonyms: None Editor: SBuckley, 2010
Juncus cooperi image
Max Licher
Juncus cooperi image
Max Licher
Juncus cooperi image
Max Licher
Juncus cooperi image
Max Licher
Click to Display
5 Total Images
NSF NEON | Open Data to Understand our Ecosystems The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.