Senecio triangularis |
Senecio bigelovii |
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arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
nodding groundsel, nodding ragwort |
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Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, (20–)40–80(–120) cm (caudices fibrous-rooted). | ||||
Herbage | glabrous or sparsely floccose-tomentose when young. |
usually floccose-tomentose to glabrescent, sometimes glabrous. |
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Stems | single or loosely clustered. |
single or loosely clustered. |
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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). |
progressively reduced distally; petiolate (proximal); blades ovate to lanceolate, 7–15 × (1–)2–5 cm, bases contracted or tapered, margins subentire or serrate to dentate (mid and distal leaves similar, sessile, bractlike, often clasping). |
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Ray florets | ± 8; corolla laminae 9–15 mm. |
0. |
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Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13 or ± 21, 6–12 mm, tips green. |
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Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 4–10 linear bractlets (lengths mostly 1/3–1/2 phyllaries, sometimes 1 or 2 equaling phyllaries). |
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Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
nodding (especially when young), (1–)3–12(–20) in racemiform or paniculiform arrays (terminal heads often largest). |
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Cypselae | glabrous. |
glabrous. |
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2n | = 40, 80. |
= 40. |
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Senecio triangularis |
Senecio bigelovii |
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Phenology | Flowering summer. | |||||
Habitat | Damp places, open woodlands, especially rocky stream banks in coniferous forests | |||||
Elevation | 100–3300 m (300–10800 ft) | |||||
Distribution |
AK; AZ; CA; CO; ID; MT; NM; NV; OR; WA; WY; AB; BC; NT; YT; PH
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AZ; CO; NM; UT; WY; s Rocky Mountains and adjacent areas of the United States
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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.) |
Varieties 2 (2 in the flora). The two varieties of Senecio bigelovii are distinguished by morphologic tendencies and by geography. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 566. | FNA vol. 20, p. 549. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | Ligularia bigelovii | ||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | A. Gray: in War Department [U.S.], Pacif. Railr. Rep. 4(5): 111. (1857) | ||||
Web links |