Senecio astephanus |
Senecio atratus |
|
---|---|---|
San Gabriel ragwort |
tall blacktip ragwort |
|
Habit | Perennials, 40–100 cm (caudices unknown). | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). |
Herbage | unevenly floccose-lanate or tomentose, glabrescent. |
floccose-tomentose to canescent, sometimes unevenly glabrescent. |
Stems | single. |
1–(2–5). |
Leaves | progressively reduced distally; petiolate; blades elliptic-ovate to lanceolate, 10–20(–30?) × 3–7+ cm, bases tapered, margins dentate to denticulate (teeth cartilaginous; mid leaves similar, sessile, smaller; distal leaves bractlike). |
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 | 0. |
(± 3) ± 5; corolla laminae 5–8 mm. |
Phyllaries | ± 21, 7–8 mm, tips greenish. |
(± 5) ± 8, 6–8 mm, tips black. |
Calyculi | of 5–8+ lance-linear to filiform bractlets (lengths 1/3–7/8 phyllaries). |
of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
Heads | 10–20+ in loose or congested, cymiform arrays. |
20–60+ in corymbiform or subpaniculiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. (A report of 2n = 46 is presumably erroneous.) |
Senecio astephanus |
Senecio atratus |
|
Phenology | Flowering spring. | Flowering late spring–early fall. |
Habitat | Steep, rocky slopes | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance |
Elevation | 400–1500 m (1300–4900 ft) | 2800–4000 m (9200–13100 ft) |
Distribution |
CA |
CO; NM; UT; WY
|
Discussion | Of conservation concern. Senecio astephanus is collected infrequently. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 553. | FNA vol. 20, p. 554. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. atratus var. milleflorus, S. milleflorus | |
Name authority | Greene: Pittonia 1: 174. (1888) | Greene: Pittonia 3: 105. (1896) |
Web links |