Senecio sylvaticus |
Senecio sphaerocephalus |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
ball-head ragwort, marsh groundsel, mountain marsh butterweed |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, (30–)40–80 cm (rhizomes stout). |
Herbage | puberulent (hairs abundant, curly). |
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). |
reduced distally; petiolate; blades oblanceolate to elliptic, 4–12x 1–4 cm, bases tapered, margins weakly dentate or denticulate (denticles callous; mid leaves similar, smaller; distal leaves bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 13; corolla laminae 6–10 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
(± 13) ± 21, 3–7 mm, tips black or brownish. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 1–5 bractlets (longest 2–3 mm). |
Heads | 12–24 in corymbiform arrays. |
(3–)5–24 in corymbiform arrays. |
Cypselae | hairy (especially on angles). |
usually hairy, sometimes glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio sphaerocephalus |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering spring–early summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Open meadows, especially in coniferous associations |
Elevation | 100–300 m (300–1000 ft) | 1000–1800 m (3300–5900 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
ID; MT; NV; OR; UT; WY
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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.) |
|
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 555. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. altus, S. latus, S. lugens var. hookeri | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Greene: Pittonia 3: 106. (1896) |
Web links |
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