Senecio megacephalus |
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large-head groundsel, rocky ragwort |
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Habit | Perennials, (15–)30–50 cm (rhizomes woody, suberect or creeping). |
Herbage | loosely arachno-tomentose, unevenly glabrescent. |
Stems | single or clustered. |
Leaves | progressively reduced distally; weakly petiolate; blades lanceolate to narrowly oblanceolate, 10–18+ × 1–2(–3+) cm, bases tapered, margins entire or wavy (often with dark, cartilaginous denticles; mid leaves similar, smaller, sessile; distal leaves bractlike). |
Ray florets | ± 13; corolla laminae (5–)15–20 mm. |
Phyllaries | ± 21, 9–12(–14) mm, tips not notably blackened (short-hairy). |
Calyculi | of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries). |
Heads | usually 1 (sometimes subtended by 1–2 smaller heads). |
Cypselae | glabrous. |
2n | = 40. |
Senecio megacephalus |
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Phenology | Flowering summer. |
Habitat | Rocky, moist or drying sites, especially on mountain slopes |
Elevation | 1500–2500 m (4900–8200 ft) |
Distribution |
ID; MT; WY; AB; BC |
Source | FNA vol. 20, p. 553. |
Parent taxa | |
Sibling taxa | |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 410. (1841) |
Web links |