Senecio sylvaticus |
Senecio aronicoides |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
butterweed, rayless groundsel, rayless ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous). |
Herbage | puberulent (hairs abundant, curly). |
loosely and sparsely arachnose to finely 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). |
progressively reduced distally; petiolate; blades ovate or oblanceolate to oblong, 7–20 × 2–3 cm, bases broadly to narrowly tapered, margins repand-denticulate or sublaciniate to subentire (mid and distal leaves sessile, smaller, weakly clasping). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
0 or 1–2; corolla laminae 4–7 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 8 or ± 13, 4–8 mm, tips green or black. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm). |
Heads | 12–24 in corymbiform arrays. |
(6–)15–30+ in corymbiform arrays. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio aronicoides |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering spring–early summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Dry or drying sites in open woodlands, upper foothills and montane forests |
Elevation | 100–300 m (300–1000 ft) | 800–2500 m (2600–8200 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
CA; OR
|
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. 556. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. leptolepis, S. rawsonianus | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838) |
Web links |
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