Senecio sylvaticus |
Senecio sacramentanus |
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Sacramento ragwort |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, 20–50 cm (caudices fibrous-rooted). |
Herbage | puberulent (hairs abundant, curly). |
sparsely pubescent to tomentose (especially on abaxial leaf faces and among heads). |
Stems | single. |
single or loosely clustered. |
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). |
progressively reduced distally; petiolate; blades triangular, triangular-lanceolate, or lanceolate, 3–10(–15) × 1.5–4 cm, bases cordate to truncate or tapered, margins serrate or dentate (mid and distal leaves sessile, bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
0. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 8, 6–9 mm, tips green. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 2–5+ lance-deltate to filiform bractlets (lengths 1/5–1/2 phyllaries). |
Heads | 12–24 in corymbiform arrays. |
nodding, 6–10+ in racemiform-paniculiform arrays. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
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Senecio sylvaticus |
Senecio sacramentanus |
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Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Late summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Montane meadows |
Elevation | 100–300 m (300–1000 ft) | 3000–3500 m (9800–11500 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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NM |
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.) |
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Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 550. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Wooton & Standley: Contr. U.S. Natl. Herb. 16: 194. (1913) |
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