Senecio atratus |
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tall blacktip ragwort |
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Habit | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). |
Herbage | floccose-tomentose to canescent, sometimes unevenly glabrescent. |
Stems | 1–(2–5). |
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). |
Ray florets | (± 3) ± 5; corolla laminae 5–8 mm. |
Phyllaries | (± 5) ± 8, 6–8 mm, tips black. |
Calyculi | of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
Heads | 20–60+ in corymbiform or subpaniculiform arrays. |
Cypselae | glabrous. |
2n | = 40. (A report of 2n = 46 is presumably erroneous.) |
Senecio atratus |
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Phenology | Flowering late spring–early fall. |
Habitat | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance |
Elevation | 2800–4000 m (9200–13100 ft) |
Distribution |
CO; NM; UT; WY
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Source | FNA vol. 20, p. 554. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | |
Synonyms | S. atratus var. milleflorus, S. milleflorus |
Name authority | Greene: Pittonia 3: 105. (1896) |
Web links |