Senecio sylvaticus |
Senecio sacramentanus |
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wood groundsel, woodland ragwort |
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Habit | Herbs annual, (1.5)3–8+ dm; from fibrous taproots. | |
Stems | 1, densely pubescent with abundant curly hairs. |
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Leaves | evenly distributed along stems, obovate to oblong in outline, bases tapering, usually 1–2-pinnately lobed or divided, ultimate margins dentate; proximal petiolate; distal clasping and bract-like. |
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Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
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Involucres | cylindric. |
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Ray florets | 0, rarely 1–8; rays 1–2+ mm. |
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Disc florets | 40–50. |
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Phyllaries | 13+, rarely 21, 4–7+ mm; tips green or minutely black. |
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Calyculi | 0 or 1–5+ linear to filiform bractlets, 2–3 mm. |
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Fruits | 1.5–2.5 mm, sparsely pubescent on ribs. |
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Heads | 12–24. |
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2n | =40. |
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Senecio sylvaticus |
Senecio sacramentanus |
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Distribution | ||
Discussion | Disturbed open wooded areas. Flowering May–Oct. 0–1200 m. Casc, CR, ECas, Est, Sisk, WV. CA, WA; north to British Columbia, scattered in eastern North America; Asia, Europe. Exotic. Senecio sylvaticus is a native of Eurasia and favors cool, damp climates. In overall appearance, it resembles the more common S. vulgaris. However, the latter has distinctive black-tipped phyllaries, while S. sylvaticus has phyllaries that are generally green-tipped. This species is well established in the Pacific Northwest and in parts of eastern Canada. Elsewhere it is sporadic. |
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Source | Flora of Oregon, volume 2, page 341 Debra Trock |
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Sibling taxa | ||
Web links |
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