Senecio aphanactis |
Senecio sylvaticus |
|
---|---|---|
California groundsel, chaparral ragwort, rayless ragwort |
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
|
Habit | Annuals, 5–20+ cm (taproots relatively short and thin). | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). |
Herbage | glabrous or sparsely tomentose (especially distally). |
puberulent (hairs abundant, curly). |
Stems | usually 1 (relatively thin, delicate). |
single. |
Leaves | evenly distributed; sessile; blades oblanceolate to lance-linear, 2–4 × 0.5–1 cm, bases sometimes weakly clasping, margins usually subpinnate to dentate, sometimes subentire (distal leaves bractlike). |
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 | 0 or 1–5; corolla laminae 0.5–1+ mm (barely surpassing phyllaries, heads perhaps technically disciform). |
0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
Phyllaries | ± 8 or ± 13, 5–6 mm, tips greenish. |
± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
Calyculi | 0 or of 1–3+ lance-deltate bractlets. |
0 or of 1–5+ linear to filiform bractlets. |
Heads | 4–10+ in open, cymiform arrays. |
12–24 in corymbiform arrays. |
Cypselae | densely hairy. |
hairy (especially on angles). |
2n | = 40. |
= 40. |
Senecio aphanactis |
Senecio sylvaticus |
|
Phenology | Flowering late winter–spring. | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). |
Habitat | Dry, open ground, especially alkaline flats | Mildly disturbed woodlands, open, sandy sites |
Elevation | 10–400 m (0–1300 ft) | 100–300 m (300–1000 ft) |
Distribution |
CA; Mexico (Baja California)
|
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
Discussion | Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. 563. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Name authority | Greene: Pittonia 1: 220. (1888) | Linnaeus: Sp. Pl. 2: 868. (1753) |
Web links |
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