Senecio actinella |
Senecio vulgaris |
|
---|---|---|
Flagstaff ragwort |
common groundsel, common ragwort, old-man-in-the-spring |
|
Habit | Perennials, (7–)20–30(–40+) cm (rhizomes exfoliating). | Annuals, (10–)20–50(–60+) cm (taprooted). |
Herbage | densely lanate-tomentose, glabrescent (especially on adaxial faces of leaves). |
glabrous or sparsely and unevenly tomentose when young. |
Stems | single. |
usually 1. |
Leaves | mostly basal; petiolate; blades narrowly obovate, (2–)3–7(–10) × 1–2(–3+) cm, bases tapered, margins subentire to denticulate (cauline leaves bractlike). |
evenly distributed; petiolate; blades ovate to oblanceolate, 2–10 × 0.5–2(–4) cm, bases tapered, margins lobulate to dentate, ultimate margins often secondarily dentate to denticulate (distal leaves sessile). |
Ray florets | ± 13; corolla laminae usually 8–10 mm (sometimes tubular, unexpanded, heads then perhaps technically disciform). |
0. |
Phyllaries | ± 21, 8–12 mm, tips greenish (with white bristles). |
± 21, 4–6 mm, tips usually green, sometimes black. |
Calyculi | of (1–)5–8+ linear to filiform bractlets (lengths 1/3–3/4 phyllaries). |
of 2–4(–6+) bractlets (prominent, black-tipped, lengths about 1/4 phyllaries). |
Heads | 1(–3). |
8–20 in loose, corymbiform arrays. |
Cypselae | hairy. |
usually sparsely hairy, sometimes nearly glabrous. |
2n | = 40. |
|
Senecio actinella |
Senecio vulgaris |
|
Phenology | Flowering summer. | Flowering early spring (through summer in far North). |
Habitat | In duff, rocky woodlands, especially in pine-dominated areas | Disturbed sites |
Elevation | 2000–3000 m (6600–9800 ft) | 1–1000 m (0–3300 ft) |
Distribution |
AZ; NM; Mexico (Chihuahua, Durango)
|
AK; AL; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NV; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; SPM; Greenland; Eurasia [Probably introduced]
|
Discussion | Plants of Senecio actinella with relatively small proximal leaves similar to basal leaves and adaxial leaf faces early glabrate have been recognized as var. mogollonicus; the distinction is difficult to maintain. Receptacles in Senecio actinella are sometimes insect-infested. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio vulgaris has not been collected in the Canadian Arctic north of Hudson Bay. A widely scattered weed of Eurasian origin, Senecio vulgaris is particularly abundant in southern areas of cool damp winters or northern areas of cool damp summers. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 553. | FNA vol. 20, p. 562. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. actinella var. mogollonicus, S. mogollonicus | |
Name authority | Greene: Bull. Torrey Bot. Club 10: 87. (1883) | Linnaeus: Sp. Pl. 2: 867. (1753) |
Web links |
|