Senecio crassulus |
Senecio aronicoides |
|
---|---|---|
mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
butterweed, rayless groundsel, rayless ragwort |
|
Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous). |
Herbage | glabrous. |
loosely and sparsely arachnose to finely tomentose, unevenly glabrescent. |
Stems | 1–(2–4). |
single. |
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 ovate or oblanceolate to oblong, 7–20 × 2–3 cm, bases broadly to narrowly tapered, margins repand-denticulate or sublaciniate to subentire (mid and distal leaves sessile, smaller, weakly clasping). |
Ray florets | ± 8 or ± 13; corolla laminae 5–12 mm. |
0 or 1–2; corolla laminae 4–7 mm. |
Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
± 8 or ± 13, 4–8 mm, tips green or black. |
Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm). |
Heads | (1–)4–12 in corymbiform arrays. |
(6–)15–30+ in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. |
Senecio crassulus |
Senecio aronicoides |
|
Phenology | Flowering summer. | Flowering spring–early summer. |
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | Dry or drying sites in open woodlands, upper foothills and montane forests |
Elevation | 2200–3700 m (7200–12100 ft) | 800–2500 m (2600–8200 ft) |
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
|
CA; OR
|
Source | FNA vol. 20, p. 551. | FNA vol. 20, p. 556. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. lapathifolius, S. semiamplexicaulis | S. leptolepis, S. rawsonianus |
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838) |
Web links |