Cirsium flodmanii |
Cirsium cymosum |
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peregrine thistle |
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Habit | Plants biennial or perennial, 2.5–12 dm; taprooted, sometimes with creeping roots. | |
Stems | usually 1, sparsely to densely arachnoid-villous, often also tomentose to glabrate. |
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Leaves | oblanceolate to elliptic, 10–40(50) × 3–12 cm; margins 1–2-pinnate; spines 2–7 mm; surfaces glabrate to arachnoid-tomentose; abaxial veins prominent; straw-colored; basal usually present at flowering, sessile, clasping, decurrent, or petiolate. |
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Involucres | ovoid to hemispheric or campanulate, 1.5–3.5 × 1.5–5 cm, glabrate to thinly tomentose. |
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Florets | corollas 20–38 mm, cream-colored to purple; tubes 8–15 mm; throats 5.5–12 mm; lobes 5.5–7 mm; style tips 4–6(7) mm. |
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Phyllaries | with glutinous ridges; tips ascending to spreading; spines fine, 2–4 mm. |
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Fruits | 5–8 mm; light to dark brown; pappi 15–25 mm. |
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Heads | 1–few. |
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Cirsium flodmanii |
Cirsium cymosum |
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Distribution | ||
Discussion | Western United States. 2 varieties. |
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Source | Flora of Oregon, volume 2, page 225 Bridget Chipman |
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Sibling taxa | ||
Subordinate taxa | ||
Web links |