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Asteraceae
Ambrosia

not marked as a favorite taxon Ambrosia artemisiifolia Linnaeus. Common name: Common Ragweed, Hogweed. Phenology: Jul-Nov. Habitat: Roadsides, gardens, disturbed soils, thin soils on rock outcrops. Distribution: NL (Newfoundland), NU, and BC south to FL, TX, CA and southward.

Glossary (beta!)

Origin/Endemic status: Native

Synonymy ⓘ: = Ar, Bah, C, Can, Fl7, G, GrPl, Il, Mex, Mi, NcTx, NE, NY, Oh3, Ok, Pa, Tn, Tx, Va, WH3, McMillan & Prevost (2022); < Ambrosia artemisiifolia L. — FNA21, K4, RAB, SE1; > Ambrosia artemisiifolia L. var. artemisiifolia — F; > Ambrosia artemisiifolia L. var. elatior (L.) Descourt. — F, Tat; > Ambrosia artemisiifolia L. var. paniculata (Michx.) Blank. — F; > Ambrosia elatior L. — S; > Ambrosia glandulosa Scheele — S; > Ambrosia monophylla (Walter) Rydb. — S; Ambrosia artemisiifolia L. Basionym: Ambrosia artemisiifolia L. 1753

Links to other floras: < Ambrosia artemisiifolia - FNA21

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FACU
  • Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
  • Great Plains: FACU (taxonomic split from wetland indicator species)
  • Midwest: FACU (taxonomic split from wetland indicator species)
  • Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily ⓘ: 8

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image #1 of Ambrosia artemisiifolia© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #2 of Ambrosia artemisiifolia© Richard & Teresa Ware CC-BY-NC, permission granted to NCBG | Original Image ⭷
image #3 of Ambrosia artemisiifolia© Gary P. Fleming | Original Image ⭷
image #4 of Ambrosia artemisiifolia© Joey Shaw source | Original Image ⭷
image #5 of Ambrosia artemisiifolia© Joey Shaw source | Original Image ⭷
image #6 of Ambrosia artemisiifolia© Erik Danielson source | Original Image ⭷
image #7 of Ambrosia artemisiifolia© Scott Ward | Original Image ⭷
image #8 of Ambrosia artemisiifolia© Scott Ward | Original Image ⭷
image #9 of Ambrosia artemisiifolia© Scott Ward | Original Image ⭷
image #10 of Ambrosia artemisiifolia© Scott Ward | Original Image ⭷
image #11 of Ambrosia artemisiifolia© Scott Ward | Original Image ⭷
image #12 of Ambrosia artemisiifolia© Radford, Ahles and Bell | Original Image ⭷

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Horticultural Information

NCBG trait

Intro: Erect, often bushy, tap-rooted annual of roadsides, gardens, disturbed soils and thin soils on rock outcrops.

Stems: Stems simple to branched, sometimes reddish, smooth to rough-hairy.

Leaves: Leaves opposite below and alternate above, oval to elliptic in outline, 1-4 in. long, deeply 2 times divided into narrow, blunt-tipped lobes; gland-dotted and with a pungent odor when crushed, smooth.

Inforescence:

Flowers: Male (staminate) flowers in small, green, nodding, cup-shaped heads arranged in spikes (1-4 in. long) at tips of branches; female (pistillate) flowers tiny, in round, green clusters in upper leaf axils, each cluster with 1-3 flowers surrounded by tiny bracts. All flowers lack petals and sepals.

Fruits:

Comments: Male flowers release large amounts of allergy-provoking pollen.

Height: 1-6 ft.

plant sale text:

bloom table text:

description: Erect, often bushy, tap-rooted annual of roadsides, gardens, disturbed soils and thin soils on rock outcrops.

stems: Stems simple to branched, sometimes reddish, smooth to rough-hairy.

leaves: Leaves opposite below and alternate above, oval to elliptic in outline, 1-4 in. long, deeply 2 times divided into narrow, blunt-tipped lobes; gland-dotted and with a pungent odor when crushed, smooth.

inflorescence:

flowers: Male (staminate) flowers in small, green, nodding, cup-shaped heads arranged in spikes (1-4 in. long) at tips of branches; female (pistillate) flowers tiny, in round, green clusters in upper leaf axils, each cluster with 1-3 flowers surrounded by tiny bracts. All flowers lack petals and sepals.

fruits:

comments: Male flowers release large amounts of allergy-provoking pollen.

cultural notes:

germination code:

native range: North America



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