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greater burdock

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

Distribution
[WildflowerSearch map]
[BONAP county map]
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
A. minus, A. tomentosum
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