Senecio integerrimus |
Senecio sylvaticus |
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lambstongue ragwort, western groundsel |
wood groundsel, woodland ragwort |
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Habit | Herbs perennial or biennial, (1)2–7 dm; caudices button-like, with fleshy, fibrous, unbranched roots. | Herbs annual, (1.5)3–8+ dm; from fibrous taproots. |
Stems | 1, loosely arachnoid-tomentose, or villous, glabrate with age. |
1, densely pubescent with abundant curly hairs. |
Leaves | mostly basal; cauline progressively reduced distally; ± petiolate; basal and lower cauline elliptic, lanceolate, linear, oblanceolate, rounded-deltate, rarely suborbiculate, bases tapered or truncate to cordate; margins entire or dentate; distal becoming sessile and bract-like. |
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. |
Inflorescences | corymb-like arrays; bracts 0 or inconspicuous. |
corymb-like arrays; bracts 0 or inconspicuous. |
Involucres | urn-shaped. |
cylindric. |
Ray florets | 5, rarely 0; rays 6–15(20) mm, yellow or white to pale yellow. |
0, rarely 1–8; rays 1–2+ mm. |
Disc florets | 35–45. |
40–50. |
Phyllaries | (8)13 or 21; tips usually black, sometimes green. |
13+, rarely 21, 4–7+ mm; tips green or minutely black. |
Calyculi | 1–5+, inconspicuous, usually < 2 mm. |
0 or 1–5+ linear to filiform bractlets, 2–3 mm. |
Fruits | 2.5–3 mm, usually glabrous, sometimes hairy along ribs. |
1.5–2.5 mm, sparsely pubescent on ribs. |
Heads | 6–15(30+). |
12–24. |
2n | =40, 80. |
=40. |
Senecio integerrimus |
Senecio sylvaticus |
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Distribution | ||
Discussion | Western North America. 5 varieties; 3 varieties treated in Flora. |
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. |
Source | Flora of Oregon, volume 2, page 339 Debra Trock |
Flora of Oregon, volume 2, page 341 Debra Trock |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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