Illinois Natural History Survey - University of Illinois

Ambrosia artemisiifolia
Annual ragweed, Roman wormwood, Common ragweed
Taxonomy

Synonyms: Ambrosia artemisiifolia elatior, Ambrosia artemisiifolia var. paniculata

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

Images

   
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Species Distribution
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County Map Legend
Absent:
Not known from county
Medium confidence:
Medium or unknown confidence;
often old records or unverifiable observations
Medium-high confidence:
Often observations by expert botanists
High confidence:
Often vouchered herbarium records
Planted / introduced:
Native species introduced outside historic range,
or only in planted locations within county (e.g., restorations)
Historic / extirpated:
Only historic records for the species; likely extirpated
(Note that this category is not yet functional)

North American distribution maps for this species: FLNAUSDA PlantsBONAPBISON

Collection & Observation Phenology [?]

J
0
F
0
M
0
A
0
M
0
J
0
J
0
A
0
S
0
O
0
N
0
D
0

Collection & Observation Timeline [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Dicot-herb, annual

Roots: adventitious, fibrous

Shoots: alternate, opposite leaf arrangment; simple leaf type; lobed (pinnately) leaf margin; Pinnate leaf venation; oblong, lanceolate leaf shape

Inflorescence: raceme, spike, head

Flowers: unisexual, monoecious; 5 merous; incomplete, not sepals; yellow, green; epigynous ovary position

Fruit: achene

Physiology: autotrophic; C3 C02 fixation

Ecology & Natural History

Habitat: Probably not part of any native community, but rather in weedy situations following human distrurbance; eroded broken ground; roadsides; along railroads.

ILPIN Notes: Stems erect, much branched, rough pubescent. One of the most important hayfever plants. Fruits often eaten by wild turkeys. Muenscher, W.C. 1975. Poisonous Plants of the United States.

Functional Relationships:

  • Pollinators insects (wind)

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

Coefficient of Conservatism (C-value) [?] :

  • Entire State: 0
  • Chicago Area: 0

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