Senecio sylvaticus |
Senecio rapifolius |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
openwoods ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, (20–)30–60 cm (rhizomes branched, spreading or suberect). |
Herbage | puberulent (hairs abundant, curly). |
(unevenly purple-tinged, often glaucous) glabrous. |
Stems | single. |
1–(2–3). |
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 ovate to oblanceolate, 4–8(–9+) × (2–)3–5 cm, bases tapered, margins dentate to incised-dentate (some denticles callous; mid leaves similar, smaller, ± clasping; distal leaves 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. |
(± 5) ± 8, 3–4(–5) mm, tips green or brownish. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
Heads | 12–24 in corymbiform arrays. |
25–60+ in cymiform clusters of 3–12. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio rapifolius |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering late summer–early fall. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Rocky hillsides and cliffs in coniferous wooded areas |
Elevation | 100–300 m (300–1000 ft) | 1800–2800 m (5900–9200 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
CO; ID; SD; WY
|
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. 553. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 409. (1841) |
Web links |
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