Carduus pycnocephalus |
Carduus pycnocephalus(synonym of Carduus pycnocephalus ssp. pycnocephalus) |
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compact-headed thistle, Italian thistle |
compact-headed thistle, Italian thistle |
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Habit | Plants annual, 2–20 dm. | Plants annual, 2–20 dm. |
Basal leaves | 10–25 cm, deeply lobed or pinnatifid. |
10–25 cm, deeply lobed or pinnatifid. |
Cauline leaves | obovate or oblanceolate to linear-elliptic, 4–15 cm, shallowly or deeply lobed or pinnatifid; lobe margins and tips spiny; surfaces abaxially tomentose, adaxially hispid-pustulose. |
obovate or oblanceolate to linear-elliptic, 4–15 cm, shallowly or deeply lobed or pinnatifid; lobe margins and tips spiny; surfaces abaxially tomentose, adaxially hispid-pustulose. |
Involucres | cylindric or ellipsoid, 10–25 mm in diameter. |
cylindric or ellipsoid, 10–25 mm in diameter. |
Disc florets | corollas 14–16 mm, purple. |
corollas 14–16 mm, purple. |
Phyllaries | narrowly lanceolate; margins not membranous; midribs prominent. |
narrowly lanceolate; margins not membranous; midribs prominent. |
Fruits | 4–6 mm, tan or brown; pappus bristles 15–20 mm. |
4–6 mm, tan or brown; pappus bristles 15–20 mm. |
Heads | 2–5 per cluster; peduncles winged. |
2–5 per cluster; peduncles winged. |
2n | =54, 60, 62. |
=54, 60, 62. |
Carduus pycnocephalus |
Carduus pycnocephalus |
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Distribution | ||
Discussion | Disturbed areas, waste areas, riverbanks. Flowering May–Jul. 50–700 m. CR, Sisk, WV. CA, ID; widely scattered in US; Asia, Europe. Exotic. |
Disturbed areas, waste areas, riverbanks. Flowering May–Jul. 50–700 m. CR, Sisk, WV. CA, ID; widely scattered in US; Asia, Europe. Exotic. |
Source | Flora of Oregon, volume 2, page 211 Kenton Chambers |
Flora of Oregon, volume 2, page 211 Kenton Chambers |
Sibling taxa | ||
Synonyms | Carduus pycnocephalus ssp. pycnocephalus | Carduus pycnocephalus ssp. pycnocephalus |
Web links |
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