Senecio sylvaticus |
Senecio clarkianus |
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Clark's ragwort |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, (50–)60–100(–120) cm (caudices fibrous-rooted). |
Herbage | puberulent (hairs abundant, curly). |
sparsely floccose-tomentose, unevenly glabrescent. |
Stems | single. |
single. |
Leaves | evenly distributed; petiolate; blades obovate to oblong, 3–7(–12) × 1–3(–4) cm, usually 1–2-pinnate, bases tapered, ultimate margins dentate (distal leaves similar, clasping, bractlike). |
evenly distributed; petiolate; well-developed mid leaves: blades lanceolate to oblong,(8–)10–15(–18) × (2–)3–5(–9) cm overall, margins deeply dentate or irregularly pinnate-lobed to laciniate; distal leaves sessile, weakly clasping. |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8 or ± 13; corolla laminae 8–12(–20) mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13 or ± 21, 5–8 mm, tips green. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 3–8+ linear to filiform bractlets (lengths 1/2–3/4+ phyllaries). |
Heads | 12–24 in corymbiform arrays. |
8–20 in corymbiform arrays. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
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Senecio sylvaticus |
Senecio clarkianus |
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Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering late summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Moist meadows, conifer-dominated sites |
Elevation | 100–300 m (300–1000 ft) | 1400–2700 m (4600–8900 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
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CA
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Discussion | Senecio sylvaticus is a Eurasian weed that favors cool, wet climates. It is well established in coastal areas of the Pacific Coast and in parts of Newfoundland and Quebec; elsewhere in the flora, it appears to be sporadic. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio clarkianus grows on west slopes of the central and southern Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 566. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | A. Gray: Proc. Amer. Acad. Arts 7: 362. (1868) |
Web links |
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