Senecio triangularis |
Senecio amplectens |
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arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
alpine groundsel, showy alpine ragwort |
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Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, (5–)10–60 cm (rhizomatous or with branched caudices). | ||||
Herbage | glabrous or sparsely floccose-tomentose when young. |
(often purplish-tinged) glabrous or sparsely and unevenly hairy, especially near leaf axils and among heads, usually glabrescent. |
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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). |
usually progressively reduced distally (basal sometimes smaller than proximal or mid leaves); petiolate (petioles shorter than to equaling blades, often clasping); blades broadly lanceolate or lanceolate to oblanceolate, (5–)10–20+ × 2–4(–5+) cm, bases tapered, margins dentate to denticulate (distal leaves smaller, bractlike). |
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Ray florets | ± 8; corolla laminae 9–15 mm. |
usually ± 13, sometimes fewer; corolla laminae (10–)15–25 mm. |
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Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
± 13 or ± 21, tips often black or brownish (sometimes with scattered black hairs). |
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Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
of 2–5+ linear to filiform bractlets (lengths to 1/2 phyllaries). |
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Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
nodding, 1–5(–10). |
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Cypselae | glabrous. |
glabrous. |
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2n | = 40, 80. |
= 40, ca. 175–180. |
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Senecio triangularis |
Senecio amplectens |
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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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CO; MT; NM; NV; UT; WY
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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 varieties of Senecio amplectens are distinguished by morphologic tendencies and habitat preferences; there are many intermediates. Where the ranges of the two overlap, var. amplectens occurs at slightly lower elevations than var. holmii. (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. 552. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | Ligularia amplectens | ||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | A. Gray: Amer. J. Sci. Arts, ser. 2, 33: 240. (1862) | ||||
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