Senecio sylvaticus |
Senecio megacephalus |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
large-head groundsel, rocky ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, (15–)30–50 cm (rhizomes woody, suberect or creeping). |
Herbage | puberulent (hairs abundant, curly). |
loosely arachno-tomentose, unevenly glabrescent. |
Stems | single. |
single or clustered. |
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; weakly petiolate; blades lanceolate to narrowly oblanceolate, 10–18+ × 1–2(–3+) cm, bases tapered, margins entire or wavy (often with dark, cartilaginous denticles; mid leaves similar, smaller, sessile; distal leaves bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 13; corolla laminae (5–)15–20 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 21, 9–12(–14) mm, tips not notably blackened (short-hairy). |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries). |
Heads | 12–24 in corymbiform arrays. |
usually 1 (sometimes subtended by 1–2 smaller heads). |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio megacephalus |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering summer. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Rocky, moist or drying sites, especially on mountain slopes |
Elevation | 100–300 m (300–1000 ft) | 1500–2500 m (4900–8200 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; WY; AB; 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. 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: 410. (1841) |
Web links |
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