Senecio viscosus |
Senecio taraxacoides |
|
---|---|---|
stickly groundsel, sticky ragwort |
dandelion ragwort |
|
Habit | Annuals, (10–)20–40(–60) cm (taprooted). | Perennials, 5–10(–14) cm (caudices branched, fibrous-rooted). |
Herbage | densely fetid-viscid (hairs glandular). |
(sometimes purple-tinged) floccose-tomentose (persistently on abaxial faces of leaves, glabrescent elsewhere). |
Stems | single. |
single or loosely clustered. |
Leaves | evenly distributed; petiolate; blades obovate to oblong (pinnately dissected to pinnatifid), 2–7 × 1.5–4 cm, bases tapered or ± truncate, ultimate margins wavy or crenate-dentate (distal leaves sessile, smaller, ± clasping). |
± evenly distributed; petiolate; blades oblanceolate to ovate, (1–)2–6 × 1–2.5 cm, bases tapered, margins dentate or incised to subpinnatifid (distal leaves bractlike). |
Ray florets | ± 13; corolla laminae 1–2 mm (usually coiled, scarcely surpassing phyllaries). |
usually ± 13, sometimes fewer or 0; corolla laminae 8–12 mm. |
Phyllaries | (± 13) ± 21, 5–7 mm, tips black. |
± 13 or ± 21, 7–10 mm, tips green. |
Calyculi | of 2–5 bractlets (largest to 4 mm). |
of 2–5 lance-linear bractlets (lengths 1/3–2/3 phyllaries). |
Heads | (1–)3–8(–30) in irregular, corymbiform arrays. |
1(–5). |
Cypselae | usually glabrous, sometimes hairy. |
glabrous. |
2n | = 40. |
= 40. |
Senecio viscosus |
Senecio taraxacoides |
|
Phenology | Flowering spring–fall. | Late summer. |
Habitat | Disturbed sites, especially open sandy or gravelly places | Alpine peaks |
Elevation | 1–300 m (0–1000 ft) | 3500–4000 m (11500–13100 ft) |
Distribution |
CT; IL; MA; ME; MN; NH; NJ; NY; PA; RI; WI; AB; BC; MB; NB; NF; NS; ON; PE; QC; SK; SPM; Eurasia [Introduced in North America]
|
CO; NM |
Discussion | Senecio viscosus is a smelly, Eurasian weed now widely scattered in areas of cool damp climates, often as a casual waif. The viscid hairs trap wind-blown particles of sand, dust, and soot, which give the surfaces varying textures and colors. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 562. | FNA vol. 20, p. 551. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. amplectens var. taraxacoides, Ligularia taraxacoides | |
Name authority | Linnaeus: Sp. Pl. 2: 868. (1753) | (A. Gray) Greene: Pittonia 4: 119. (1900) |
Web links |