Senecio crassulus |
Senecio sylvaticus |
|
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mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
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Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). |
Herbage | glabrous. |
puberulent (hairs abundant, curly). |
Stems | 1–(2–4). |
single. |
Leaves | (thickish-turgid) progressively reduced distally; petiolate; blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, often clasping). |
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). |
Ray florets | ± 8 or ± 13; corolla laminae 5–12 mm. |
0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
0 or of 1–5+ linear to filiform bractlets. |
Heads | (1–)4–12 in corymbiform arrays. |
12–24 in corymbiform arrays. |
Cypselae | glabrous. |
hairy (especially on angles). |
2n | = 40. |
= 40. |
Senecio crassulus |
Senecio sylvaticus |
|
Phenology | Flowering summer. | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). |
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | Mildly disturbed woodlands, open, sandy sites |
Elevation | 2200–3700 m (7200–12100 ft) | 100–300 m (300–1000 ft) |
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
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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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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. 551. | FNA vol. 20, p. 563. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. lapathifolius, S. semiamplexicaulis | |
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | Linnaeus: Sp. Pl. 2: 868. (1753) |
Web links |
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