Senecio atratus |
Senecio lyonii |
|
---|---|---|
tall blacktip ragwort |
island senecio, Lyon's ragwort |
|
Habit | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). | Subshrubs or shrubs, (20–)40–150 cm (taproots woody). |
Herbage | floccose-tomentose to canescent, sometimes unevenly glabrescent. |
sparsely hairy, unevenly glabrate (usually with persistent tomentum in leaf axils and on abaxial leaf faces). |
Stems | 1–(2–5). |
usually multiple (arching upwards). |
Leaves | progressively reduced distally; petiolate; blades oblong-ovate to oblanceolate, (5–)10–30 × 1.5–4(–6) cm, bases tapered, margins dentate (denticles, dark, callous; mid leaves similar, sessile, smaller; distal leaves bractlike). |
evenly distributed (proximal withering before flowering); sessile or obscurely petiolate; blades ± oblong or elliptic, (4–)6–10(–12) × 1.5–3 cm (1–2-pinnatifid, lobes ± linear, 1–2 mm wide), bases ± linear, ultimate margins entire. |
Ray florets | (± 3) ± 5; corolla laminae 5–8 mm. |
± 13; corolla laminae 8–10 mm. |
Phyllaries | (± 5) ± 8, 6–8 mm, tips black. |
(± 13) ± 21, (5–)6–8 mm, tips minutely black. |
Calyculi | of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
0 or of 1–3+ (inconspicuous) bractlets. |
Heads | 20–60+ in corymbiform or subpaniculiform arrays. |
4–12 in cymiform arrays (involucres campanulate, 8–15 mm diam.). |
Cypselae | glabrous. |
hairy. |
2n | = 40. (A report of 2n = 46 is presumably erroneous.) |
= 40. |
Senecio atratus |
Senecio lyonii |
|
Phenology | Flowering late spring–early fall. | Flowering spring. |
Habitat | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance | Ocean bluffs, open hillsides |
Elevation | 2800–4000 m (9200–13100 ft) | 0–500 m (0–1600 ft) |
Distribution |
CO; NM; UT; WY
|
CA; Mexico (Baja California)
|
Discussion | Of conservation concern. Senecio lyonii is known from the Channel Islands (off the coast of southern California) and south. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 554. | FNA vol. 20, p. 560. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. atratus var. milleflorus, S. milleflorus | |
Name authority | Greene: Pittonia 3: 105. (1896) | A. Gray: in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 1(2): 454. (1886) |
Web links |