Senecio arizonicus |
Senecio erucifolius |
|
---|---|---|
Arizona ragwort |
hoary ragwort |
|
Habit | Perennials, (20–)30–40(–60) cm (rhizomes suberect or weakly spreading). | Perennials, 30–120 cm (rhizomes branched, sometimes producing stolons). |
Herbage | lanate-arachnose or tomentose, unevenly glabrescent. |
floccose-tomentose, unevenly glabrescent (persistently hairy on abaxial leaf faces). |
Stems | 1(–2). |
usually single, sometimes loosely clustered. |
Leaves | (often purplish abaxially) reduced distally; petiolate; blades ovate to subelliptic, (5–)6–10(–15) × (2.5–)3–5(–9) cm, bases tapered or contracted, margins subentire to denticulate (denticles callous; mid and distal leaves bractlike). |
± evenly distributed (basal and proximal sometimes withering before flowering); petiolate (proximal) or sessile; blades ovoid or oblong to spatulate (usually pinnatifid to pinnatisect, lobes ± lanceolate to linear), (3–)5–12 × (1.5–)2–4 cm, bases tapered to ± truncate, ultimate margins (often revolute) dentate or entire. |
Ray florets | ± 13; corolla laminae 5–10 mm. |
± 13; corolla laminae 12–15 mm. |
Phyllaries | (± 13) ± 21, 5–7 mm, tips green. |
± 13, 5–7 mm, tips green or greenish. |
Calyculi | of 2–5+ bractlets (largest to 3 mm). |
of 4–6(–10) bractlets (lengths to 1/2 phyllaries). |
Heads | (2–)5–12(–20) in corymbiform arrays. |
20–60 in corymbiform arrays. |
Cypselae | hairy (especially on angles). |
hairy. |
2n | = 40. |
|
Senecio arizonicus |
Senecio erucifolius |
|
Phenology | Flowering late spring–summer. | Flowering summer. |
Habitat | Openings in pine-oak woodlands | Waste grounds |
Elevation | 1600–2100 m (5200–6900 ft) | 0–200+ m (0–700+ ft) |
Distribution |
AZ
|
PA; Old World [Introduced in North America] |
Discussion | Senecio arizonicus is reputedly in southern New Mexico (W. C. Martin and C. R. Hutchins 1980); that seems unlikely and should be checked. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio erucifolius has been introduced occasionally around seaports and has persisted. At present, it appears to be uncommon and highly localized; it should be expected almost any place that its close relative, Senecio jacobaea, occurs. Senecio erucifolius was treated in Jacobaea by E. Wiebe (2000); see discussion under 53. S. jacobaea. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 555. | FNA vol. 20, p. 569. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Jacobaea erucifolia | |
Name authority | Greene: Bull. Torrey Bot. Club 10: 87. (1883) | Linnaeus: Fl. Suec. ed. 2, 291. (1755) |
Web links |