Compilation
Ambrosia artemisiifolia

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Name

Identification
Ambrosia elatior L. [family ASTERACEAE ] (stored under name); Ambrosia elatior L. [family ASTERACEAE ] Verified by James L. Reveal, Ambrosia artemisiifolia (L.) Descourt. [family ASTERACEAE ] Verified by James L. Reveal,
Related name
  • Franseria chamissonis
  • Xanthium spinosum
  • Ambrosia artemisifolia
  • Ambrosia elatior
  • Ambrosia glandulosa
  • Ambrosia artemisiifolia
Common name
  • Petite herbe à poux, Flora of North America Vol. 21

Flora

Entry for Ambrosia artemisiifolia Linnaeus [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Ambrosia artemisiifolia Linnaeus [family COMPOSITAE], Sp. Pl., 2: 988. 1753
Ambrosia artemisiifolia var. elatior (Linnaeus) Descourtilz [family COMPOSITAE]
Ambrosia artemisiifolia var. paniculata (Michaux) Blankinship [family COMPOSITAE]
Ambrosia elatior Linnaeus [family COMPOSITAE]
Ambrosia glandulosa Scheele [family COMPOSITAE]
Ambrosia monophylla (Walter) Rydberg [family COMPOSITAE]
Treatment Author(s)
John L. Strother
Information
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.
Phenology
jul-aug (summer), sep-oct (fall)
Altitude range
0–1000+ m;
Distribution
USA Ala.USA AlaskaUSA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA D.C.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Miss.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA W.Va.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada Nfld. and Labr. (Nfld.)Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Hybrids between Ambrosia artemisiifolia and A. psilostachya have been called A. ×intergradiens W. H. Wagner. The name Ambrosia ×helenae Rouleau applies to hybrids between A. artemisiifolia and A. trifida.

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