Xanthium spinosum

Linnaeus
Sp. Pl. 2: 987. 1753.
Common names: Spiny cocklebur clotbur lampourde épineuse
Synonyms: Xanthium ambrosioides Hooker & Arnott Xanthium spinosum var. inerme Bel
Treatment appears in FNA Volume 21. Treatment on page 19. Mentioned on page 20.

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: Flowering Jul–Oct.
Habitat: Damp or seasonally wet, alkaline soils, waste places, margins of agriculture
Elevation: 10–1000 m

Distribution

V21-28-distribution-map.gif

N.B., Ont., Que., Sask., Ala., Ariz., Calif., Colo., Conn., Del., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Oreg., Pa., R.I., S.C., Tenn., Tex., Utah, Va., Wash., W.Va., Mexico, Central America, South America, widely established in Old World.

Discussion

Some authors have contended that Xanthium spinosum originated in South America and is introduced and/or naturalized everywhere else that it is found.

Selected References

None.

Lower Taxa

None.

... more about "Xanthium spinosum"
John L. Strother +
Linnaeus +
Spiny cocklebur +, clotbur +  and lampourde épineuse +
N.B. +, Ont. +, Que. +, Sask. +, Ala. +, Ariz. +, Calif. +, Colo. +, Conn. +, Del. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Utah +, Va. +, Wash. +, W.Va. +, Mexico +, Central America +, South America +  and widely established in Old World. +
10–1000 m +
Damp or seasonally wet, alkaline soils, waste places, margins of agriculture +
Flowering Jul–Oct. +
Xanthium ambrosioides +  and Xanthium spinosum var. inerme +
Xanthium spinosum +
Xanthium +
species +