Senecio aronicoides |
|
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butterweed, rayless groundsel, rayless ragwort |
|
Habit | Perennials (biennials?), 30–90 cm (caudices buttonlike, roots unbranched, fleshy-fibrous). |
Herbage | loosely and sparsely arachnose to finely tomentose, unevenly glabrescent. |
Stems | single. |
Leaves | 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 or 1–2; corolla laminae 4–7 mm. |
Phyllaries | ± 8 or ± 13, 4–8 mm, tips green or black. |
Calyculi | 0 or of 1–3+ oblong to linear bractlets (seldom more than 1.5 mm). |
Heads | (6–)15–30+ in corymbiform arrays. |
Cypselae | glabrous. |
2n | = 40. |
Senecio aronicoides |
|
Phenology | Flowering spring–early summer. |
Habitat | Dry or drying sites in open woodlands, upper foothills and montane forests |
Elevation | 800–2500 m (2600–8200 ft) |
Distribution |
CA; OR
|
Source | FNA vol. 20, p. 556. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | |
Synonyms | S. leptolepis, S. rawsonianus |
Name authority | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 426. (1838) |
Web links |