Senecio sylvaticus |
Senecio sheldonensis |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials, 30–40(–50) cm (caudices branched, fibrous-rooted). |
Herbage | puberulent (hairs abundant, curly). |
glabrous or with scattered hairs near leaf bases and among heads. |
Stems | single. |
single or loosely 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). |
evenly distributed; petiolate or subsessile; blades lanceolate, 4–10 × 2–4 cm, bases ± tapered, margins denticulate (distal leaves sessile, smaller). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8; corolla laminae ± 10 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13, 7–10 mm, tips black (hairy). |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 3–7 bractlets (0.5–3 mm). |
Heads | 12–24 in corymbiform arrays. |
(1–)3–5(–6) in cymiform arrays. |
Cypselae | hairy (especially on angles). |
glabrous. |
2n | = 40. |
|
Senecio sylvaticus |
Senecio sheldonensis |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering late Jul–mid Aug. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Subalpine meadows and valleys |
Elevation | 100–300 m (300–1000 ft) | 1200–1800 m (3900–5900 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
BC; NT; YT |
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.) |
Senecio sheldonensis is infrequently collected and poorly understood. The treatment here is provisional. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 567. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | A. E. Porsild: Canad. Field-Naturalist 64: 43. (1950) |
Web links |
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