ILLINOIS PLANT INFORMATION NETWORK
 
 ILPIN INFORMATION ON    Juncus biflorus
 
 
 CLASS:    MONOCOTYLEDENAE
 ORDER:    JUNCALES
 FAMILY:   JUNCACEAE
 SCIENTIFIC NAME:  Juncus biflorus
 AUTHORITY:  Ell.
 
 COMMON NAMES:
    TWO-FLOWERED RUSH
 
 SYNONOMY:   None
 
 PLANTS CODE: JUBI
 
 NATURAL COMMUNITIES:
     PRAIRIE
       TYPICAL PRAIRIE
         WET
     WETLAND
       MARSH
       BORDER OF LAKE
 
 
 SAF FOREST COVER TYPE:
     NO
 
 NATURAL DIVISION:  UNAVAILABLE
 
 COUNTIES:
   ALEXANDER       BOND            CASS            CHRISTIAN       CLARK
   CLAY            CLINTON         COLES           COOK            CRAWFORD
   CUMBERLAND      EDWARDS         EFFINGHAM       FAYETTE         FRANKLIN
   GALLATIN        HAMILTON        JACKSON         JASPER          JEFFERSON
   JOHNSON         KANKAKEE        LAWRENCE        LEE             MACOUPIN
   MARION          MASON           MASSAC          MENARD          MORGAN
   PERRY           POPE            PULASKI         RANDOLPH        RICHLAND
   ST. CLAIR       SALINE          SHELBY          UNION           WABASH
   WASHINGTON      WAYNE           WHITE           WILLIAMSON      WINNEBAGO
 
 
 GROWTH FORM:  Monocot
 
 TAXONOMIC CHARACTERISTICS:
    ROOTS:  Adventitious   (rhizomes)
    LEAF ARRANGEMENT:   Alternate
    LEAF TYPE:   Simple
    LEAF MARGIN:   Entire
    LEAF VENATION:  Parallel
    LEAF SHAPE:     Linear
    INFLORESCENCE:   Other
    FLOWER MEROUS:  3
    FLOWER STRUCTURE:   Complete   Regular
    FLOWER COLOR:   Green   Others
    FLOWER PLACEMENT:  Hypogynous
    FRUIT:   Capsule
 
 DISTINGUISHING CHARACTERISTIC COMMENTS:
     J. biflorus, as opposed to Juncus marginatus, with which this species
     often occurs, is: more robust with thicker, more branched and more
     knotty underground stems; found in wetter places.
 
 GEOGRAPHIC INFORMATION:
     ORIGIN:   Native
 
 GEOGRAPHIC COMMENTS:
     Species is occasional to common in southern 1/2 of Illinois.
 
 POPULATION DYNAMICS:
     STATE STATUS: Not listed
     FEDERAL STATUS: Not listed
     COMMONNESS:  Common
     ENDEMIC:   NOT-ENDEMIC
 
 BIOLOGIC:
     HABIT:   Grasslike
     LIFE CYCLE:   Perennial
     REPRODUCTION:   Sexual   Vegetative
     FLOWERING PERIOD:
         MONTH BEGINNING-      5         MONTH END-      9
     TROPHIC STATUS:  Autotrophic
     SEX:      Perfect
 
 ECODISTRIBUTION COMMENTS:
     Species is distributed in moist or wet meadows or shores. Also, it is
     found in prairie swales, sandy open ground, usually in acid soils,
     other wet habitats, moist sands.
 
 ENVIRONMENTAL RELATIONSHIPS:   No data entered
 
 FUNCTIONAL RELATIONSHIPS:
     MAJOR POLLINATION AGENT:   Wind
 
 HUMAN RELATIONSHIP DATA:    No data entered
 
 WILDLIFE AND LIVESTOCK INFORMATION:   No data entered
 
 REVEGETATION PLANTINGS:    No data entered
 
 
 REFERENCES:
Mohlenbrock, R. H., ed.  1975.  Guide to the vascular flora of Illinois.
     Southern Illinois University Press, Carbondale.  494 pp.
Steyermark, J. A.  1963.  Flora of Missouri.  Iowa State University Press, Ames.
     1725 pp.
Swink, F., and G. S. Wilhelm.  1979.  Plants of the Chicago region.  Third ed.
     The Morton Arboretum, Lisle, Illinois.  922 pp.
Gleason, H. A.  1952.  The new Britton and Brown illustrated flora of the
     northeastern United States and adjacent Canada.  3 vols.  The New York
     Botanical Garden, New York.
 
 END OF DATA FOR SPECIES  Juncus biflorus
 
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 ILPIN was developed by Louis Iverson*, with data compiled by David Ketzner and Jeanne Karnes
 Illinois Natural History Survey, 607 E. Peabody Dr., Champaign, IL 61820
     *currently employed by USDA Forest Service, 359 Main Rd., Delaware, OH 43015