Senecio elmeri |
Senecio atratus |
|
---|---|---|
Elmer's butterweed, Elmer's ragwort |
tall blacktip ragwort |
|
Habit | Perennials, 10–20(–30) cm (rhizomes trailing or branching). | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). |
Herbage | unevenly villous-tomentose or floccose, glabrescent. |
floccose-tomentose to canescent, sometimes unevenly glabrescent. |
Stems | single (from loosely clustered basal leaves). |
1–(2–5). |
Leaves | progressively reduced distally; ± petiolate; blades ovate to oblanceolate, (3–)4–8(–10) × 2–3(–4) cm, bases tapered, margins shallowly dentate (mid and distal leaves smaller, bractlike, often clasping). |
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). |
Ray florets | ± 8; corolla laminae 8–15 mm. |
(± 3) ± 5; corolla laminae 5–8 mm. |
Phyllaries | (± 8) ± 13, 8–10 mm, tips black (villous). |
(± 5) ± 8, 6–8 mm, tips black. |
Calyculi | of 2–7 lance-linear to linear bractlets (lengths 1/3–2/3 phyllaries). |
of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
Heads | erect or weakly nodding (especially in bud), (2–)5–9(–12) in loose, cymiform arrays. |
20–60+ in corymbiform or subpaniculiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. (A report of 2n = 46 is presumably erroneous.) |
Senecio elmeri |
Senecio atratus |
|
Phenology | Flowering summer. | Flowering late spring–early fall. |
Habitat | Alpine and subalpine rocky sites and talus slopes | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance |
Elevation | 2000–3000 m (6600–9800 ft) | 2800–4000 m (9200–13100 ft) |
Distribution |
WA; BC
|
CO; NM; UT; WY
|
Source | FNA vol. 20, p. 551. | FNA vol. 20, p. 554. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. crepidineus | S. atratus var. milleflorus, S. milleflorus |
Name authority | Piper: Erythea 7: 173. (1899) | Greene: Pittonia 3: 105. (1896) |
Web links |