Senecio sylvaticus |
Senecio neowebsteri |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Olympic Mountain ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, 7–15(–20+) cm (rhizomes fibrous-rooted). |
Herbage | puberulent (hairs abundant, curly). |
(sometimes purplish-tinged) floccose-tomentose, unevenly glabrescent. |
Stems | single. |
single or loosely clustered (erect or arching). |
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). |
mostly cauline; petiolate (petioles about equaling blades); blades lanceolate or oblanceolate to ovate, (2–)4–8+ × 1.5–3 cm, bases tapered, margins denticulate (distal leaves smaller, lanceolate or linear-lanceolate, bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 13; corolla laminae ± 15 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
usually ± 21, sometimes ± 13, (8–)10–15 mm, tips usually greenish (often sparsely hairy). |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 4–8 lanceolate to lance-linear bractlets (lengths mostly less than 1/2 phyllaries). |
Heads | 12–24 in corymbiform arrays. |
nodding, 1(–2). |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio neowebsteri |
|
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 | High talus slopes |
Elevation | 100–300 m (300–1000 ft) | 2200–2600 m (7200–8500 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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WA
|
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. 553. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. websteri | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | S. F. Blake: Leafl. W. Bot. 8: 143. (1957) |
Web links |
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