Senecio triangularis |
Senecio quaylei |
|
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arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
quayle's ragwort |
|
Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Annuals, 80–120 cm (taproots surrounded by fibrous roots). |
Herbage | glabrous or sparsely floccose-tomentose when young. |
glabrous or sparsely hairy. |
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; blades ovate, 12–24 × 8–12 cm, bases tapered or contracted, margins wavy and dentate to denticulate (mid leaves sessile, ovate to broadly lanceolate, nearly as large as basal and proximal; distal sessile, lanceolate to linear-lanceolate, becoming bractlike). |
Ray florets | ± 8; corolla laminae 9–15 mm. |
± 8; corolla laminae 7–10 mm. |
Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13, 7–9 mm, tips green to grayish. |
Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 2–7 bractlets (1–3 mm). |
Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
20–40+ in corymbiform arrays or cymiform clusters. |
Cypselae | glabrous. |
hirtellous. |
2n | = 40, 80. |
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Senecio triangularis |
Senecio quaylei |
|
Phenology | Flowering summer. | Flowering spring. |
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | Open, disturbed sites, especially roadsides |
Elevation | 100–3300 m (300–10800 ft) | 200–400 m (700–1300 ft) |
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
|
TX |
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.) |
Of conservation concern. Senecio quaylei resembles S. ampullaceus; it is more robust and glabrous, and has prominently clasping mid-cauline leaves. The size and robustness suggest that it may be a polyploid derivative of S. ampullaceus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 566. | FNA vol. 20, p. 561. |
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) | T. M. Barkley: Sida 19: 286, figs. 1, 2. (2000) |
Web links |