Ambrosia artemisiifolia L.
  • Sp. Pl.
  • Ambrosia cun feglia d'artemisia


Cite taxon page as 'WFO (2021): Ambrosia artemisiifolia L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000063493. Accessed on: 26 Oct 2021'

General Information

Annuals, 20-150 cm. Stems erect. Leaves opposite and alternate; petiole 2.5-3.5(-6) cm; blade deltate to lanceolate or elliptic, 2.5-5.5(-9) × 2-3(-5) cm, pinnately 1- or 2-lobed, abaxially sparsely pilosulose to strigillose, adaxially strigillose, both surfaces gland-dotted, base cuneate, ultimate margin entire or toothed. Female capitula clustered, proximal to male; floret 1. Male capitula: peduncles 0.5-1.5 mm; involucres shallowly cup-shaped (usually without black veins), 2-3 mm in diam., glabrous or hispid to pilosulose; florets 12-20. Burs ± globose to pyriform, 2-3 mm, ± pilosulose, spines or tubercles 3-5, near middle or apex, conical to acerose, 0.1-0.5 mm, tips straight. Fl. Jul-Oct, fr. Sep-Oct. 2n = 34, 36.

  • Provided by: [F].Flora Of CHina @ efloras.org
    • Source: [
    • 1
    • ]. 

    Annuals, 10–60(–150+) cm. Stems erect. Leaves opposite (proximal) and alternate; petioles 25–35(–60+) mm; blades deltate to lanceolate or elliptic, 25–55(–90+) × 20–30(–50+) mm, 1–2-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial faces sparsely pilosulous to strigillose, adaxial faces strigillose, both gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0.5–1.5 mm; involucres shallowly cup-shaped (usually without black nerves), 2–3+ mm diam., glabrous or hispid to pilosulous; florets 12–20+. Burs: bodies ± globose to pyriform, 2–3 mm, ± pilosulous, spines or tubercles 3–5+, near middles or distal, ± conic to acerose, 0.1–0.5+ mm, tips straight. 2n = 34, 36.

  • Provided by: [D].Flora of North America @ efloras.org
    • Source: [
    • 2
    • ]. 

    "Annual weed 3–10 dm, branching at least above, variously hairy or in part subglabrous; lvs opposite below, alternate above, once or more often twice pinnatifid, the blade narrowly to broadly ovate or elliptic in outline, 4–10 cm, the middle and lower ones, at least, evidently petiolate; staminate invols short-pedunculate, symmetrical or slightly oblique, inconspicuously nerved; fruiting invols 3–5 mm, 1-fld and 1 beaked, with a single series of short, sharp, erect spines near or above the middle; 2n=34, 36. Waste places; throughout our range, w. to the Pacific. (July) Aug.–Oct. (A. elatior; A. media)"

  • Provided by: [G].New York Botanical Garden
    • Source: [
    • 3
    • ]. 

    Morphology

    20–90 cm hoch. Stängel abstehend behaart. Blätter doppelt fiederschnittig, gestielt. Blütenköpfchen klein, eingeschlechtig, männliche mit 4–5 mm Durchmesser, in ährigen Trauben, nickend, mit je 5–12 Röhrenblüten, Hülle halbkugelig, kahl, Hüllblätte

  • Provided by: [C].Flora Helvetica – Illustrierte Flora der Schweiz
    • Source: [
    • 4
    • ]. 

    Bushy annual herb, up to 2 m high. Ultimate leaf segments on average broader than 2 mm. Female heads several clustered in leaf axils below male heads. Flowers whitish, cream or yellowish.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 5
    • ]. 

    Annual herb, up to 2 m high; coarse, bushy. Stems pilose when young, later rough-pubescent. Leaves mostly alternate; blade ovate in outline, pinnatisect or bipinnatisect, the ultimate segments oblong, narrowly obovate or elliptic, on average > 2 mm wide, lobe apices obtuse, acute or acuminate, lobe margins sometimes with 1 or 2 coarse teeth, pubescent on both surfaces, more densely so below, often drying very discolorous, aromatic or not; petiole ± 20 mm long. Heads unisexual; male heads small, drooping, in slender, leafless, terminal spikes up to ± 100 mm long, arranged in panicles, involucral bracts connate, cup-shaped, containing several, functionally male florets; female heads sessile, several clustered in leaf axils below male heads, involucral bracts connate, turbinate, enveloping cypsela, containing single female floret, corolla absent. Flowers: disc florets only, whitish; Jan.-Apr. Fruit with cypsela ovoid, enveloped in turbinate, involucral bracts, with 4-6 spines on shoulders. Pappus absent.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 6
    • ]. 

    A coarse, bushy annual herb up to 2 m tall, stems pilose when young, later rough-pubescent. Leaves mostly alternate, pinnatisect or bipinnatisect, the ultimate segments lanceolate or elliptic, on average more than 2 mm broad, obtuse, acute or acuminate, sometimes with 1 or 2 coarse teeth, pubescent on both surfaces, more densely so below, often drying very discolorous, aromatic or not. Male heads small, drooping, in slender terminal spikes up to c. 10 cm long, arranged in panicles, the female heads clustered in the leaf axils below them.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 7
    • ]. 

    Ecology

    8–10. Äcker, Wegränder, Schuttplätze, kollin. CH, in starker Ausbreitung.

  • Provided by: [C].Flora Helvetica – Illustrierte Flora der Schweiz
    • Source: [
    • 4
    • ]. 

    Habitat

    Weed along roadsides, riverbanks and disturbed places.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 5
    • ]. 

    Kalahari Deciduous Acacia-wooded Grassland; Dry Grassland. Weed of disturbed places.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 6
    • ]. 

    Forming colonies on roadsides, river banks and flood plains.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 7
    • ]. 

    Distribution

    Native to America.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 5
    • ]. 

    Native to Americas.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 6
    • ]. 

    An American ragweed now widespread in Natal from coast to Drakensberg below about 1700 m. Also in the Transvaal, O.F.S., tropical Africa, Australia and Europe.

  • Provided by: [B].e-Flora of South Africa
    • Source: [
    • 7
    • ]. 

    Distribution Map

     
    • Native distribution
    Found in
    • Southern America Brazil Acre
    • Amapí
    • Amazonas
    • Parí
    • Rondônia
    • Bahia
    • Ceará
    • Paraába
    • Paraní
    • Rio Grande do Sul
    • Santa Catarina
    • Minas Gerais
    • Rio de Janeiro
    • São Paulo

    Other Local Names

    NameLanguageCountry
    Ambrosia cun feglia d'artemisiaRaeto-RomanceCH
    Ambroisie à feuilles d'armoiseFrenchCH
    Ambrosia con foglie di artemisiaItalianCH
    Aufrechtes TraubenkrautGermanCH

      Bibliography

     Information From

    Compositae
    CC0 1.0 Universal (CC0 1.0). https://creativecommons.org/publicdomain/zero/1.0
    • A CC0 1.0 Universal (CC0 1.0).
    e-Flora of South Africa
    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • B All Rights Reserved
    Flora Helvetica – Illustrierte Flora der Schweiz
    http://www.flora-helvetica.ch
    Flora Helvetica – Illustrierte Flora der Schweiz, Konrad Lauber, Gerhart Wagner, Andreas Gygax. Haupt Verlag 2018.
    • C All Rights Reserved
    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • D Flora of North America Association
    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    http://floradobrasil.jbrj.gov.br
    Brazil Flora G (2014): Brazilian Flora 2020 project - Projeto Flora do Brasil 2020. v393.147. Instituto de Pesquisas Jardim Botanico do Rio de Janeiro. Dataset/Checklist. doi:10.15468/1mtkaw
    • E Group Brazil Flora, REFLORA Program
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • F Missouri Botanical Garden
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • G Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • H CC0 1.0 Universal (CC0 1.0).