Senecio sylvaticus |
Senecio ampullaceus |
|
---|---|---|
heath groundsel, wood groundsel, woodland groundsel, woodland ragwort |
Texas ragwort |
|
Habit | Annuals, (15–)30–80+ cm (taproots fibrous-rooted). | Annuals, (10–)20–80 cm (roots relatively thin, branching). |
Herbage | puberulent (hairs abundant, curly). |
loosely arachno-tomentose, unevenly glabrate or glabrescent. |
Stems | single. |
single. |
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 (petioles broadly winged); blades ovate-lanceolate, 3–8(–10) × (1–)1.5–3(–4) cm, bases tapered or ± truncate, margins dentate to subentire (mid leaves subsessile, lanceolate; distal subulate, bractlike). |
Ray florets | 0 or 1–8+; corolla laminae usually 1–2+ mm (barely surpassing phyllaries). |
± 8; corolla laminae 8–15 mm. |
Phyllaries | ± 13 (± 21), 4–7+ mm, tips greenish or minutely black. |
± 13, (6–)7–10 mm, tips green to grayish. |
Calyculi | 0 or of 1–5+ linear to filiform bractlets. |
of 2–8 bractlets (1–2+ mm). |
Heads | 12–24 in corymbiform arrays. |
(1–)10–30 in corymbiform arrays. |
Cypselae | hairy (especially on angles). |
hirtellous. |
2n | = 40. |
|
Senecio sylvaticus |
Senecio ampullaceus |
|
Phenology | Flowering late spring–summer (northern areas of cool, climate); winter (southern areas). | Flowering early–mid spring. |
Habitat | Mildly disturbed woodlands, open, sandy sites | Open sandy or disturbed sites |
Elevation | 100–300 m (300–1000 ft) | 100–800 m (300–2600 ft) |
Distribution |
CA; LA; MA; MI; NJ; OH; OR; PA; WA; WI; BC; NB; NF; NS; PE; QC; Eurasia [Introduced in North America]
|
TX
|
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 ampullaceus has been reported for Arkansas and Missouri (St. Louis). It is similar to S. quaylei. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 563. | FNA vol. 20, p. 561. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. ampullaceus var. floccosus, S. ampullaceus var. glaberrimus | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | Hooker: Bot. Mag. 63: plate 3478. (1836) |
Web links |
|