Compilation
Xanthium spinosum

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Name

Identification
Xanthium spinosum L. [family ASTERACEAE ] (stored under name);
Related name
  • Arctium sp.
  • Franseria chamissonis
  • Xanthium not on sheet
  • Xanthium spinosum
  • Xanthium ambrosioides
  • Ambrosia artemisiifolia
Common name
  • lampourde épineuse, Flora of North America Vol. 21
  • Spiny cocklebur, Flora of North America Vol. 21
  • clotbur, Flora of North America Vol. 21

Flora

Entry for Xanthium spinosum 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
Xanthium spinosum Linnaeus [family COMPOSITAE], Sp. Pl., 2: 987. 1753
Xanthium ambrosioides Hooker & Arnott [family COMPOSITAE]
Xanthium spinosum var. inerme Bel [family COMPOSITAE]
Treatment Author(s)
John L. Strother
Information
Plants 10–60(–120+) cm; nodal spines usually in pairs, simple or 2–3-partite, 15–30+ mm. Leaves: petioles 1–15(–25+) mm; blades ± ovate to lanceolate or lance-linear, 4–8(–12+) × 1–3(–5+) cm, often pinnately 3(–7+)-lobed, abaxial faces gray to white, densely strigose. Burs 10–12(–15+) mm. 2n = 36.
Phenology
jul-aug (summer), sep-oct (fall)
Altitude range
10–1000 m;
Distribution
MexicoCentral AmericaSouth Americawidely established in Old World.USA Ala.USA Ariz.USA Calif.USA Colo.USA Conn.USA Del.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA MaineUSA Md.USA Mass.USA Mich.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 OhioUSA Oreg.USA Pa.USA R.I.USA S.C.USA Tenn.USA Tex.USA UtahUSA Va.USA Wash.USA W.Va.Canada N.B.Canada Ont.Canada Que.Canada Sask.
Discussion
Some authors have contended that Xanthium spinosum originated in South America and is introduced and/or naturalized everywhere else that it is found.

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