Senecio triangularis |
Senecio clarkianus |
|
---|---|---|
arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
Clark's ragwort |
|
Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, (50–)60–100(–120) cm (caudices fibrous-rooted). |
Herbage | glabrous or sparsely floccose-tomentose when young. |
sparsely floccose-tomentose, unevenly glabrescent. |
Stems | single or loosely clustered. |
single. |
Leaves | evenly distributed; petiolate; blades narrowly triangular, (3–)4–10+ × 2–6 cm, bases usually ± truncate, sometimes tapered, margins usually dentate, rarely subentire (distal leaves subsessile, smaller). |
evenly distributed; petiolate; well-developed mid leaves: blades lanceolate to oblong,(8–)10–15(–18) × (2–)3–5(–9) cm overall, margins deeply dentate or irregularly pinnate-lobed to laciniate; distal leaves sessile, weakly clasping. |
Ray florets | ± 8; corolla laminae 9–15 mm. |
± 8 or ± 13; corolla laminae 8–12(–20) mm. |
Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13 or ± 21, 5–8 mm, tips green. |
Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 3–8+ linear to filiform bractlets (lengths 1/2–3/4+ phyllaries). |
Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
8–20 in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40, 80. |
|
Senecio triangularis |
Senecio clarkianus |
|
Phenology | Flowering summer. | Flowering late summer. |
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | Moist meadows, conifer-dominated sites |
Elevation | 100–3300 m (300–10800 ft) | 1400–2700 m (4600–8900 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
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CA
|
Discussion | Plants of Senecio triangularis with narrow, subentire leaves that taper to the petioles are occasionally encountered in acid bogs in Oregon and Washington and less frequently elsewhere. They are regarded as edaphic variants; they have been recognized as var. angustifolius. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Senecio clarkianus grows on west slopes of the central and southern Sierra Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 566. | FNA vol. 20, p. 566. |
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio |
Sibling taxa | ||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | |
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | A. Gray: Proc. Amer. Acad. Arts 7: 362. (1868) |
Web links |