Carduus nutans |
Carduus acanthoides |
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musk thistle, nodding thistle |
plumeless thistle |
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Habit | Plants annual or biennial, 4–20+ dm. | |
Basal leaves | 10–40 cm, 1–2-pinnate. |
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Cauline leaves | lanceolate to elliptic or linear, 4–25 cm, shallowly to deeply lobed or pinnate; lobe margins and tips spiny; surfaces glabrous or tomentose. |
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Involucres | hemispheric, 20–60 mm in diameter. |
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Disc florets | corollas 15–28 mm, purple. |
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Phyllaries | broadly or narrowly lanceolate; midribs prominent. |
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Fruits | 4–5 mm, tan or brown; pappus bristles 13–25 mm. |
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Heads | solitary or in pairs, often nodding; peduncles not winged. |
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2n | =16. |
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Carduus nutans |
Carduus acanthoides |
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Distribution | ||
Discussion | Disturbed areas, clearcuts. Flowering Jun–Oct. 0–1900 m. Col, ECas, Owy, WV. CA, ID, NV, WA; throughout most of North America; Asia, Europe. Exotic. |
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Source | Flora of Oregon, volume 2, page 211 Kenton Chambers |
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Sibling taxa | ||
Subordinate taxa | ||
Web links |
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