Senecio sylvaticus |
Senecio pattersonensis |
|
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Mono ragwort, Mount Patterson senecio |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, to 10 cm (rhizomes branching). |
Herbage | puberulent (hairs abundant, curly). |
(sometimes reddish-tinged, especially proximally) glabrous. |
Stems | single. |
1–3 (arching upward). |
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 (proximal often withering before flowering); obscurely petiolate or sessile; blades oblanceolate to lance-linear (sometimes with 1–2 lateral lobes), 2–4 cm × 3–5 mm, bases subdecurrent, weakly clasping, margins entire or wavy (often revolute). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8; corolla laminae 5–10 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13, 5–7(–8) mm. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 3–5+ (inconspicuous) bractlets. |
Heads | 12–24 in corymbiform arrays. |
1(–4). |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
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Senecio sylvaticus |
Senecio pattersonensis |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Talus slopes |
Elevation | 100–300 m (300–1000 ft) | 3000–3700 m (9800–12100 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
CA; NV |
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.) |
Of conservation concern. Senecio pattersonensis has the aspect of a depauperate S. fremontii with notably narrow leaves. Some plants in collections appear to be intergrades with S. spartioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 564. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. revolutus | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Hoover: Leafl. W. Bot. 5: 60. (1947) |
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