Senecio megacephalus

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 410. 1841.

Endemic
Treatment appears in FNA Volume 20. Treatment on page 553. Mentioned on page 547.

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). Heads usually 1 (sometimes subtended by 1–2 smaller heads). Calyculi of 5–8+ linear to filiform bractlets (lengths 1/2–7/8+ phyllaries). Phyllaries ± 21, 9–12(–14) mm, tips not notably blackened (short-hairy). Ray florets ± 13; corolla laminae (5–)15–20 mm. Cypselae glabrous. 2n = 40.


Phenology: Flowering summer.
Habitat: Rocky, moist or drying sites, especially on mountain slopes
Elevation: 1500–2500 m

Distribution

V20-1220-distribution-map.gif

Alta., B.C., Idaho, Mont., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.