Senecio crassulus |
Senecio wootonii |
|
---|---|---|
mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
Wooton's butterweed, Wooton's ragwort |
|
Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Perennials, (15–)20–45(–60) cm (caudices erect or weakly spreading). |
Herbage | glabrous. |
nearly always glaucous, glabrous. |
Stems | 1–(2–4). |
single or clustered. |
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). |
(thickish and turgid) progressively reduced distally; petiolate; blades ovate or obovate to lanceolate, 4–9(–15+) × 1.5–3(–4+) cm, bases tapered, margins wavy or subentire (often with callous denticles; mid and distal leaves sessile, bractlike). |
Ray florets | ± 8 or ± 13; corolla laminae 5–12 mm. |
8–10; corolla laminae 4–10 mm. |
Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
± 13 (± 21), 6–9 mm, tips green to brownish (not blackened). |
Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
of 1–3+ oblong to lance-linear bractlets (less than 3 mm). |
Heads | (1–)4–12 in corymbiform arrays. |
(3–)8–24+ in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. |
Senecio crassulus |
Senecio wootonii |
|
Phenology | Flowering summer. | Flowering spring–summer. |
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | Damp or drying sites, often in rocky, moderately disturbed sites |
Elevation | 2200–3700 m (7200–12100 ft) | 2000–3500 m (6600–11500 ft) |
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
|
AZ; CO; NM; TX; Mexico
|
Discussion | Senecio wootonii reaches its southern limit in Coahuila and Chihuahua, Mexico; farther south, it is replaced by S. toluccanus de Candolle, a similar, larger, more robust species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
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. anacletus |
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | Greene: Bull. Torrey Bot. Club 25: 122, plate 331, figs. 1, 2. (1898) |
Web links |