ILLINOIS PLANT INFORMATION NETWORK
 
 ILPIN INFORMATION ON    Ambrosia tomentosa
 
 
 CLASS:    DICOTYLEDENAE
 ORDER:    ASTERALES
 FAMILY:   ASTERACEAE
 SCIENTIFIC NAME:  Ambrosia tomentosa
 AUTHORITY:  Nutt.
 
 COMMON NAMES:
    FALSE RAGWEED
    WOLLYLEAF BURSAGE
 
 SYNONOMY:
     Franseria discolor Nutt.
 
 PLANTS CODE: AMTO3
 
 NATURAL COMMUNITIES:
     CULTURAL
       AGRICULTURAL FIELD
         CROPLAND
         PASTURELAND
       DEVELOPED LAND
 
 
 SAF FOREST COVER TYPE:
     NO
 
 NATURAL DIVISION:  UNAVAILABLE
 
 COUNTIES:
   LASALLE         MCHENRY
 
 GROWTH FORM:  Dicot-herb
 
 TAXONOMIC CHARACTERISTICS:
    ROOTS:  Adventitious   (fibrous)   (rhizomes)
    LEAF TYPE:   Simple
    LEAF MARGIN:   Lobed  (pinnately)
    LEAF VENATION:  Pinnate
 
    INFLORESCENCE:   Raceme  Spike  Head
    FLOWER STRUCTURE:   Incomplete  (no sepals)
    FLOWER COLOR:   Yellow   Green
    FLOWER PLACEMENT:  Epigynous
    FRUIT:   Achene
 
 GEOGRAPHIC INFORMATION:
     ORIGIN:   Introduced-  N. America
 
 GEOGRAPHIC COMMENTS:
     Adventive from west United States.
 
 POPULATION DYNAMICS:
     STATE STATUS: Not listed
     FEDERAL STATUS: Not listed
     COMMONNESS:  Rare
     ENDEMIC:   NOT-ENDEMIC
 
 BIOLOGIC:
     HABIT:   Forb
     LIFE CYCLE:   Perennial
     REPRODUCTION:   Sexual   Vegetative
     FLOWERING PERIOD:
         MONTH BEGINNING-      7         MONTH END-     10
     TROPHIC STATUS:  Autotrophic
     SEX:      Unisexual   -monoecious
 
 ECODISTRIBUTION COMMENTS:
     Waste ground; poorly drained irrigated areas.
 
 ENVIRONMENTAL RELATIONSHIPS:
     GROWTH OF SPECIES IN VARIOUS CONDITIONS:  No data entered
 
     HABITAT:   Moist   Dry
 
 FUNCTIONAL RELATIONSHIPS:    No data entered
 HUMAN RELATIONSHIP DATA:
     ALLERGENIC:  Yes
 
 
 WILDLIFE AND LIVESTOCK INFORMATION:   No data entered
 
 LIVESTOCK COMMENTS:
     Leaves may concentrate nitrates.
 
 REVEGETATION PLANTINGS:
     WEEDINESS:   Economic
 
 
 GENERAL COMMENTS:
     Listed as a noxious weed in CO/WY in PIN; may not be an economic weed in our
     area.
 
 
 REFERENCES:
Mohlenbrock, R. H., ed.  1986.  Guide to the vascular flora of Illinois.
     Revised and enlarged edition.  Southern Illinois University Press,
     Carbondale.  507 pp.
 
 OTHER REFERENCES:
     Stephens, H.A. 1980.  Poisonous Plants of Central United States.
 
 END OF DATA FOR SPECIES  Ambrosia tomentosa
 
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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