Senecio sylvaticus |
Senecio lyonii |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
island senecio, Lyon's ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Subshrubs or shrubs, (20–)40–150 cm (taproots woody). |
Herbage | puberulent (hairs abundant, curly). |
sparsely hairy, unevenly glabrate (usually with persistent tomentum in leaf axils and on abaxial leaf faces). |
Stems | single. |
usually multiple (arching upwards). |
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 (proximal withering before flowering); sessile or obscurely petiolate; blades ± oblong or elliptic, (4–)6–10(–12) × 1.5–3 cm (1–2-pinnatifid, lobes ± linear, 1–2 mm wide), bases ± linear, ultimate margins entire. |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 13; corolla laminae 8–10 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
(± 13) ± 21, (5–)6–8 mm, tips minutely black. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
0 or of 1–3+ (inconspicuous) bractlets. |
Heads | 12–24 in corymbiform arrays. |
4–12 in cymiform arrays (involucres campanulate, 8–15 mm diam.). |
Cypselae | hairy (especially on angles). |
hairy. |
2n | = 40. |
= 40. |
Senecio sylvaticus |
Senecio lyonii |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering spring. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Ocean bluffs, open hillsides |
Elevation | 100–300 m (300–1000 ft) | 0–500 m (0–1600 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; Mexico (Baja California)
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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.) |
Of conservation concern. Senecio lyonii is known from the Channel Islands (off the coast of southern California) and south. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 560. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 454. (1886) |
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