Senecio sylvaticus |
Senecio blochmaniae |
|
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Blochman's ragwort, dune ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Subshrubs, 45–130 cm (taproots forming woody crowns). |
Herbage | puberulent (hairs abundant, curly). |
glabrous or sparsely hairy. |
Stems | single. |
usually multiple (arching upwards). |
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 (often crowded; proximal often withering and pendulous); sessile or ± petiolate; blades linear-filiform, 3–12 cm × 1–3 mm, bases ± linear, margins entire. |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8; corolla laminae 8–10 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13, 7–10 mm, tips green. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
0 or of 1–3+ lance-deltate to linear bractlets (lengths to 1/4 phyllaries). |
Heads | 12–24 in corymbiform arrays. |
5–20 in corymbiform arrays (involucres campanulate). |
Cypselae | hairy (especially on angles). |
hirtellous (canescent). |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio blochmaniae |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering summer–early fall. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Coastal sand dunes and sandy, open flood plains |
Elevation | 100–300 m (300–1000 ft) | 0–100 m (0–300 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.) |
Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 560. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Greene: Erythaea 1: 7. (1893) |
Web links |
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