Senecio sylvaticus |
Senecio integerrimus |
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heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
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Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | ||||||||||||||||
Herbage | puberulent (hairs abundant, curly). |
arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
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Stems | single. |
single. |
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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 elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike). |
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Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
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Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
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Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
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Heads | 12–24 in corymbiform arrays. |
6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
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Cypselae | hairy (especially on angles). |
usually glabrous, sometimes hirtellous (mostly on angles). |
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2n | = 40. |
= 40, 80. |
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Senecio sylvaticus |
Senecio integerrimus |
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Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | |||||||||||||||||
Habitat | Mildly disturbed woodlands, open, sandy sites | |||||||||||||||||
Elevation | 100–300 m (300–1000 ft) | |||||||||||||||||
Distribution |
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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CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
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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.) |
Varieties 5 (5 in the flora). The varieties of Senecio integerrimus are distinguished by morphology and geography. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 556. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | ||||||||||||||||
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