Senecio sylvaticus |
Senecio taraxacoides |
|
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
dandelion ragwort |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, 5–10(–14) cm (caudices branched, fibrous-rooted). |
Herbage | puberulent (hairs abundant, curly). |
(sometimes purple-tinged) floccose-tomentose (persistently on abaxial faces of leaves, glabrescent elsewhere). |
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). |
± evenly distributed; petiolate; blades oblanceolate to ovate, (1–)2–6 × 1–2.5 cm, bases tapered, margins dentate or incised to subpinnatifid (distal leaves bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
usually ± 13, sometimes fewer or 0; corolla laminae 8–12 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13 or ± 21, 7–10 mm, tips green. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 2–5 lance-linear bractlets (lengths 1/3–2/3 phyllaries). |
Heads | 12–24 in corymbiform arrays. |
1(–5). |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio taraxacoides |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Late summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Alpine peaks |
Elevation | 100–300 m (300–1000 ft) | 3500–4000 m (11500–13100 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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CO; 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. 551. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. amplectens var. taraxacoides, Ligularia taraxacoides | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | (A. Gray) Greene: Pittonia 4: 119. (1900) |
Web links |
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