Arctium tomentosum


Gard. Dict. ed. 8, Arctium no. 3. 1768.

Common names: Woolly burdock bardane tomenteuse
Treatment appears in FNA Volume 19. Treatment on page 169. Mentioned on page 170.

Plants to 250 cm. Basal leaves: petioles hollow or solid, 10–15 cm, glandular-hairy; blades 30–40 × 16–28 cm, coarsely dentate to subentire, abaxially white-tomentose, adaxially green, sparsely short-hairy. Heads usually in corymbiform clusters, long-pedunculate. Peduncles 1.5–12 cm. Involucres 15–25 mm diam., densely cobwebby (rarely glabrate). Phyllaries linear to linear-lanceolate, inner usually purplish, margins with minute spreading or reflexed glandular hairs. Florets 30+; corollas rose-purple, (occasionally white), 9–13 mm, limb minutely glandular. Cypselae light brown, 5–8 mm; pappus bristles 1–3 mm. 2n = 36.

Phenology: Flowering summer–early fall (Jul–Oct).
Habitat: Waste places, roadsides, fields, forest clearings
Elevation: 0–1600 m



Introduced; Alta., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Colo., Conn., Maine, Mass., Minn., Mo., N.H., N.Dak., Ohio, S.Dak., Vt., Eurasia.


Arctium tomentosum has been reported from Illinois, Iowa, Maryland, New Jersey, Oregon, Pennsylvania, South Carolina, and Wisconsin; I have not seen specimens.The involucres of Arctium tomentosum are usually very densely cobwebby.

Exceptional forms of A. tomentosum have nearly glabrous involucres. Forms of A. minus with especially cobwebby involucres have been misidentified as A. tomentosum; they lack the corymbiform capitulescence and glandular corollas of the latter.

Selected References


Lower Taxa

... more about "Arctium tomentosum"
David J. Keil +
Miller +
Asteraceae tribe Cynareae +
Woolly burdock +  and bardane tomenteuse +
Alta. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Colo. +, Conn. +, Maine +, Mass. +, Minn. +, Mo. +, N.H. +, N.Dak. +, Ohio +, S.Dak. +, Vt. +  and Eurasia. +
0–1600 m +
Waste places, roadsides, fields, forest clearings +
Flowering summer–early fall (Jul–Oct). +
Gard. Dict. ed. +
Introduced +
Compositae +
Arctium tomentosum +
species +