Cirsium remotifolium |
Cirsium perplexans |
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few-leaved thistle, weak thistle |
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Habit | Plants biennial or monocarpic perennial, 2–15 dm; taprooted or from creeping roots. | |
Stems | usually 1; slender, arachnoid-villous, sometimes thinly so. |
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Leaves | linear-oblong to elliptic, 7–35 × 1–15 cm; margins entire to dentate or pinnately lobed; lobes triangular-ovate to linear; spines fine, 1–6 mm; surfaces abaxially thinly to densely tomentose, adaxially glabrate to thinly arachnoid-villous; basal occasionally present at flowering, sessile, clasping, or petiolate. |
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Involucres | hemispheric to campanulate, 1–2.5 × 1.5–3.5 cm, glabrous to thinly arachnoid-villous. |
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Florets | corollas 16–25 mm, cream-colored to purple; tubes 6–12 mm; throats 5–10.5 mm; lobes 3.5–8 mm; styles conspicuously exserted; tips 4–6 mm. |
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Phyllaries | subequal to strongly imbricate, sometimes with inconspicuous glutinous ridges; spines 1–6 mm; outer bases ? 2 mm wide. |
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Fruits | 4.5–5.5 mm, tan to dark brown; pappi 12–25 mm. |
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Heads | few–many. |
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Cirsium remotifolium |
Cirsium perplexans |
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Distribution | ||
Discussion | Western United States. 3 varieties. Cirsium remotifolium is known to form fertile hybrids with C. edule where their ranges overlap. |
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Source | Flora of Oregon, volume 2, page 228 Bridget Chipman |
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Sibling taxa | ||
Subordinate taxa | ||
Web links |
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