Senecio rapifolius |
Senecio aronicoides |
|
---|---|---|
openwoods ragwort |
butterweed, rayless groundsel, rayless ragwort |
|
Habit | Perennials, (20–)30–60 cm (rhizomes branched, spreading or suberect). | Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous). |
Herbage | (unevenly purple-tinged, often glaucous) glabrous. |
loosely and sparsely arachnose to finely tomentose, unevenly glabrescent. |
Stems | 1–(2–3). |
single. |
Leaves | progressively reduced distally; petiolate; blades ovate to oblanceolate, 4–8(–9+) × (2–)3–5 cm, bases tapered, margins dentate to incised-dentate (some denticles callous; mid leaves similar, smaller, ± clasping; distal leaves bractlike). |
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 | 0. |
0 or 1–2; corolla laminae 4–7 mm. |
Phyllaries | (± 5) ± 8, 3–4(–5) mm, tips green or brownish. |
± 8 or ± 13, 4–8 mm, tips green or black. |
Calyculi | 0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm). |
Heads | 25–60+ in cymiform clusters of 3–12. |
(6–)15–30+ in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. |
Senecio rapifolius |
Senecio aronicoides |
|
Phenology | Flowering late summer–early fall. | Flowering spring–early summer. |
Habitat | Rocky hillsides and cliffs in coniferous wooded areas | Dry or drying sites in open woodlands, upper foothills and montane forests |
Elevation | 1800–2800 m (5900–9200 ft) | 800–2500 m (2600–8200 ft) |
Distribution |
CO; ID; SD; WY
|
CA; OR
|
Source | FNA vol. 20, p. 553. | FNA vol. 20, p. 556. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. leptolepis, S. rawsonianus | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 409. (1841) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838) |
Web links |