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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.
Resembling no. 3 [Arctium lappa L.] but smaller, seldom over 13 dm; lower petioles mostly hollow; invol mostly 1.5–2.5 cm thick, ± strongly arachnoid-tomentose and the bracts only weakly or scarcely hooked; cor-limb glandular outside; 2n=36. Native of Eurasia, sparingly established in our range. June–Oct.
A robust herb. It grows 60 cm to 1.2 m tall. It takes 2 years to complete its life-cycle. The leaves are greyish white underneath. The leaves are heart shaped and 25-50 cm long by 10-30 cm wide. There are some teeth along the edge. The flower heads are cobwebby.
