Senecio crassulus |
Senecio atratus |
|
---|---|---|
mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
tall blacktip ragwort |
|
Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Perennials, (20–)35–70(–80+) cm (rhizomes or caudices branched, erect to weakly creeping). |
Herbage | glabrous. |
floccose-tomentose to canescent, sometimes unevenly glabrescent. |
Stems | 1–(2–4). |
1–(2–5). |
Leaves | (thickish-turgid) progressively reduced distally; petiolate; blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, 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 or ± 13; corolla laminae 5–12 mm. |
(± 3) ± 5; corolla laminae 5–8 mm. |
Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
(± 5) ± 8, 6–8 mm, tips black. |
Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
of 2–5 linear bractlets (lengths to 1/3 phyllaries). |
Heads | (1–)4–12 in corymbiform arrays. |
20–60+ in corymbiform or subpaniculiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. (A report of 2n = 46 is presumably erroneous.) |
Senecio crassulus |
Senecio atratus |
|
Phenology | Flowering summer. | Flowering late spring–early fall. |
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | Dry or drying, rocky or sandy sites in coniferous areas, especially sites with frequent disturbance |
Elevation | 2200–3700 m (7200–12100 ft) | 2800–4000 m (9200–13100 ft) |
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
|
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. lapathifolius, S. semiamplexicaulis | S. atratus var. milleflorus, S. milleflorus |
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | Greene: Pittonia 3: 105. (1896) |
Web links |