Arctium lappa |
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greater burdock |
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Habit | Plants 10–30 dm. |
Stems | minutely puberulent, often glandular, sometimes floccose at nodes. |
Leaves | basal 40–100+ cm; blades 15–80 cm; surfaces abaxially minutely glandular-puberulent; cauline reduced distally; petioles mostly solid, glandular-puberulent. |
Involucres | 2–4.5 cm in diameter. |
Disc florets | 30+; corollas 9–14 mm, purple to pink, rarely white glabrous or glandular-puberulent. |
Phyllaries | glabrous throughout or more cobwebby distally, lightly floccose-tomentose basally. |
Fruits | 6–7.5 mm, light brown, often mottled; pappi 2–5 mm. |
Heads | in corymb-like clusters; peduncles 2–7 cm, sometimes bracteate near heads. |
2n | =36. |
Arctium lappa |
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Distribution | |
Discussion | Roadsides, disturbed areas. Flowering Jun–Oct. 50–500 m. WV. CA, ID, WA; scattered in North America. Asia, Europe. Exotic. |
Source | Flora of Oregon, volume 2, page 181 Kenton Chambers |
Sibling taxa | |
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