ILLINOIS PLANT INFORMATION NETWORK
 
 ILPIN INFORMATION ON    Eleocharis obtusa
 
 
 CLASS:    MONOCOTYLEDENAE
 ORDER:    CYPERALES
 FAMILY:   CYPERACEAE
 SCIENTIFIC NAME:  Eleocharis obtusa
 AUTHORITY:  (Willd.) Schult.
 
 COMMON NAMES:
 NO SELECTED RECORDS IN THE SPECIFIED RANGE
 
 SYNONOMY:   None
 
 PLANTS CODE: ELCB2
 
 NATURAL COMMUNITIES:
     WETLAND
       MARSH
       FEN
       SEDGE MEADOW
       PANNE
       SEEP & SPRING
       SEEP & SPRING
         TYPICAL SEEP
         ACID GRAVEL SEEP
       BORDER OF LAKE
     PRIMARY
       LAKE SHORE
         FOREDUNE
     CULTURAL
       AGRICULTURAL FIELD
       SUCCESSIONAL FIELD
       DEVELOPED LAND
 
 
 SAF FOREST COVER TYPE:
     NO
 
 
 NATURAL DIVISION:
     Coastal Plain
        Cretaceous Hills
 
 COUNTIES:
   ADAMS           ALEXANDER       BOONE           BROWN           CALHOUN
   CARROLL         CASS            CHAMPAIGN       CHRISTIAN       CLARK
   CLAY            CLINTON         COOK            CRAWFORD        DEKALB
   DOUGLAS         DUPAGE          EDWARDS         EFFINGHAM       FAYETTE
   FRANKLIN        GALLATIN        GREENE          GRUNDY          HAMILTON
   HANCOCK         HARDIN          HENDERSON       HENRY           IROQUOIS
   JACKSON         JASPER          JEFFERSON       JERSEY          JO DAVIESS
   JOHNSON         KANE            KANKAKEE        KENDALL         KNOX
   LAKE            LAWRENCE        MCDONOUGH       MCHENRY         MACON
   MARION          MASON           MASSAC          MENARD          MONROE
   MORGAN          MOULTRIE        OGLE            PEORIA          PERRY
   PIATT           POPE            PULASKI         RICHLAND        ST. CLAIR
   SANGAMON        SCHUYLER        SHELBY          STARK           STEPHENSON
   TAZEWELL        UNION           VERMILION       WABASH          WAYNE
   WHITE           WHITESIDE       WILL            WILLIAMSON      WINNEBAGO
 
 
 GROWTH FORM:  Monocot
 
 TAXONOMIC CHARACTERISTICS:
    ROOTS:  Adventitious   (fibrous)
    LEAF ARRANGEMENT:   Alternate
    LEAF TYPE:   Simple
    LEAF MARGIN:   Entire
    LEAF VENATION:  Parallel
    LEAF SHAPE:     Linear
    INFLORESCENCE:   Head
    FLOWER MEROUS:  3
    FLOWER STRUCTURE:   Complete   Regular
    FLOWER PLACEMENT:  Hypogynous
    FRUIT:   Achene
 
 DISTINGUISHING CHARACTERISTIC COMMENTS:
     Versus the two other varieties, this one has: 1) tubercle
     greater than 2/3 width and 1/4-1/2 height of achene; 2) bristles
     mostly present, exceeding achenes.
 
 GEOGRAPHIC INFORMATION:
     ORIGIN:   Native
 
 GEOGRAPHIC COMMENTS:
     Species is found throughout Illinois, in most counties.
 
 POPULATION DYNAMICS:
     STATE STATUS: Not listed
     FEDERAL STATUS: Not listed
     COMMONNESS:  Common
     ENDEMIC:   NOT-ENDEMIC
 
 BIOLOGIC:
     HABIT:   Grasslike
     LIFE CYCLE:   Annual
     FLOWERING PERIOD:
         MONTH BEGINNING-      5         MONTH END-     10
     TROPHIC STATUS:  Autotrophic
     SEX:      Perfect
 
 ECODISTRIBUTION COMMENTS:
     Species is distributed in muddy borders of sloughs, temporary pools, roadside
     ditches, interdunal flats near Lake Michigan, old excavations
     in sandy areas, and small sandy ditches.
 
 ENVIRONMENTAL RELATIONSHIPS:   No data entered
 
 FUNCTIONAL RELATIONSHIPS:    No data entered
 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.
Mohlenbrock, R. H.  1967-continuing.  The illustrated flora of Illinois.
     Southern Illinois University Press, Carbondale.
 
 END OF DATA FOR SPECIES  Eleocharis obtusa
 
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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