Family: Asteraceae Aster Family
Genus: Ambrosia Ragweed
Genus of about 15 species of annual herbs with unisexual flower heads and producing pollen that is one of the chief causes of hay fever. Found mainly in North and South America.
Scientific Name: Ambrosia artemisiifolia L.
Common Name(s): Common Ragweed, Annual Bursage, Short Ragweed, Annual Ragweed
Growth Type: annual
Species Description:
Click on the thumbnails to view large image.
 | Caption:
ID: Hrb-AMBEL-017
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption:
ID: Hrb-AMBEL-018
Source: 35mm slide (photo)
Credit:
Keyword(s): vegetative
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 | Caption:
ID: Hrb-AMBEL-019
Source: 35mm slide (photo)
Credit:
Keyword(s): seedling
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 | Caption:
ID: Hrb-AMBEL-020
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, stem, vegetative
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 | Caption:
ID: Hrb-AMBEL-021
Source: 35mm slide (photo)
Credit:
Keyword(s): inflorescense, vegetative
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 | Caption: Common ragweed is an annual with deeply lobed leaves and separate male and female flowers on the same plant.
ID: Hrb-AMBEL-011
Source: 35mm slide (illustration)
Credit:
Keyword(s): flowering, inflorescense, leaf, mature, seedling, stem
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 | Caption: Common ragweed seedling with deeply lobed emerging leaves that have dense hairs below and are smooth above.
ID: Hrb-AMBEL-008
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption: Common ragweed seedling with emerging deeply lobed leaves that are hairy below and smooth above.
ID: Hrb-AMBEL-010
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption: Common ragweed seedling with purple-colored underside on cotyledons. Its deeply lobed emerging leaves have dense hairs below and smooth above.
ID: Hrb-AMBEL-003
Source: 35mm slide (illustration)
Credit:
Keyword(s): leaf, seedling
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 | Caption: Common ragweed seeds with sharp spines at the top.
ID: Hrb-AMBEL-006
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption: Common ragweed seeds with sharp spines at the top.
ID: Hrb-AMBEL-007
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption: Common ragweed's bushy growth habit.
ID: Hrb-AMBEL-012
Source: 35mm slide (photo)
Credit:
Keyword(s): mature
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 | Caption: Common ragweed's bushy growth habit.
ID: Hrb-AMBEL-014
Source: 35mm slide (photo)
Credit:
Keyword(s): mature
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 | Caption: Common ragweed's cotyledons and deeply lobed emerging leaves that can be either opposite or alternate
ID: Hrb-AMBEL-009
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption: Common ragweed's cotyledons and deeply lobed leaves.
ID: Hrb-AMBEL-013
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption: Common ragweed's deeply lobed leaves with hairy undersides.
ID: Hrb-AMBEL-015
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption: Common ragweed's deeply lobed leaves.
ID: Hrb-AMBEL-002
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption: Common ragweed's opposite and alternate leaves and bushy shape.
ID: Hrb-AMBEL-005
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, mature, vegetative
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 | Caption: Common ragweed's spatulate cotyledons and deeply lobed leaves.
ID: Hrb-AMBEL-001
Source: 35mm slide (illustration)
Credit:
Keyword(s): leaf, seedling
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