ILLINOIS PLANT INFORMATION NETWORK
 
 ILPIN INFORMATION ON    Iva annua
 
 
 CLASS:    DICOTYLEDENAE
 ORDER:    ASTERALES
 FAMILY:   ASTERACEAE
 SCIENTIFIC NAME:  Iva annua
 AUTHORITY:  L.
 
 COMMON NAMES:
    MARSH ELDER
    SUMPWEED
 
 SYNONOMY:
     Iva ciliata Willd.
 
 PLANTS CODE: IVAN2
 
 NATURAL COMMUNITIES:
     PRAIRIE
       TYPICAL PRAIRIE
         MESIC
         WET-MESIC
         WET
     WETLAND
       BORDER OF LAKE
     CULTURAL
       AGRICULTURAL FIELD
       SUCCESSIONAL FIELD
       DEVELOPED LAND
 
 
 SAF FOREST COVER TYPE:
     NO
 
 NATURAL DIVISION:  UNAVAILABLE
 
 COUNTIES:
   ADAMS           ALEXANDER       BOONE           BROWN           CALHOUN
   CASS            CLINTON         FAYETTE         GALLATIN        GREENE
   GRUNDY          HANCOCK         JACKSON         JEFFERSON       JERSEY
   JOHNSON         LAWRENCE        LOGAN           MCDONOUGH       MCLEAN
   MACON           MACOUPIN        MADISON         MASON           MENARD
   MONROE          MORGAN          PERRY           PIKE            PULASKI
   RANDOLPH        ST. CLAIR       SANGAMON        SCHUYLER        SCOTT
   SHELBY          UNION           WABASH          WHITE           WILLIAMSON
   WINNEBAGO
 
 GROWTH FORM:  Dicot-herb
 
 TAXONOMIC CHARACTERISTICS:
    LEAF ARRANGEMENT:   Alternate
    LEAF TYPE:   Simple
    LEAF MARGIN:   Entire
    LEAF VENATION:  Pinnate
    LEAF SHAPE:     Lanceolate   Ovate
    INFLORESCENCE:   Spike  Head
    FLOWER MEROUS:  5
    FLOWER STRUCTURE:   Incomplete  (no sepals)
    FLOWER COLOR:   Green   White
    FLOWER PLACEMENT:  Epigynous
    FRUIT:   Achene
 
 DISTINGUISHING CHARACTERISTIC COMMENTS:
     Inflorescense of spiciform branches; the heads sessile in the axils of reduced
     leaves. Leaves ovate-lanceolate, entire - margined.
 
 GEOGRAPHIC INFORMATION:
     ORIGIN:   Native
 
 POPULATION DYNAMICS:
     STATE STATUS: Not listed
     FEDERAL STATUS: Not listed
     COMMONNESS:  Occasional
     ENDEMIC:   NOT-ENDEMIC
 POPULATION STATUS COMMENTS:
     Species is more common in the southern counties.
 
 
 BIOLOGIC:
     HABIT:   Forb
     LIFE CYCLE:   Annual
     REPRODUCTION:   Sexual
     FLOWERING PERIOD:
         MONTH BEGINNING-      8         MONTH END-     10
     TROPHIC STATUS:  Autotrophic
     SEX:      Unisexual   -monoecious
 
 ECODISTRIBUTION COMMENTS:
     Sloughs, river bottom prairies and meadows; low fields in valleys,
     along roadsides and railroads.
 
 ENVIRONMENTAL RELATIONSHIPS:   No data entered
 
 FUNCTIONAL RELATIONSHIPS:    No data entered
 HUMAN RELATIONSHIP DATA:
     ALLERGENIC:  Yes
     EDIBLE:  Yes
 
 
 HUMAN FACTOR COMMENTS:
     Form with large achenes, var. macrocarpa Blake, known from Mo., N.Y. & Ark.;
     now extinct, was food of native Americans from Indian rock shelters
     of bluff dwellers of Ozarks & Ky. Var. ciliata sheds large amount of
     pollen and is considered an important hay-fever plant.
 
 WILDLIFE AND LIVESTOCK INFORMATION:   No data entered
 
 REVEGETATION PLANTINGS:
     WEEDINESS:   COLONIZING
 
 
 
 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.
Wodehouse, R. P.  1971.  Hayfever plants.  Hafner Publishing Company, New
     York.  280 pp.
 
 END OF DATA FOR SPECIES  Iva annua
 
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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