Senecio sylvaticus |
Senecio elmeri |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Elmer's butterweed, Elmer's ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, 10–20(–30) cm (rhizomes trailing or branching). |
Herbage | puberulent (hairs abundant, curly). |
unevenly villous-tomentose or floccose, glabrescent. |
Stems | single. |
single (from loosely clustered basal leaves). |
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, (3–)4–8(–10) × 2–3(–4) cm, bases tapered, margins shallowly dentate (mid and distal leaves smaller, bractlike, often clasping). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8; corolla laminae 8–15 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
(± 8) ± 13, 8–10 mm, tips black (villous). |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 2–7 lance-linear to linear bractlets (lengths 1/3–2/3 phyllaries). |
Heads | 12–24 in corymbiform arrays. |
erect or weakly nodding (especially in bud), (2–)5–9(–12) in loose, cymiform arrays. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio elmeri |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Alpine and subalpine rocky sites and talus slopes |
Elevation | 100–300 m (300–1000 ft) | 2000–3000 m (6600–9800 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
WA; BC
|
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. 551. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. crepidineus | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Piper: Erythea 7: 173. (1899) |
Web links |
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