Senecio triangularis |
Senecio fremontii |
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arrow-leaf groundsel, arrow-leaf ragwort, arrowleaf butterweed, groundsel |
dwarf mountain butterweed, dwarf mountain ragwort, Fremont's groundsel, Fremont's ragwort |
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Habit | Perennials, (20–)50–120(–200) cm (caudices branched, ± woody). | Perennials, 10–30(–40) cm (perennating bases subrhizomatous, spreading, sometimes knotty-woody). | ||||||||||||
Herbage | glabrous or sparsely floccose-tomentose when young. |
(often purple-tinged) glabrous. |
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Stems | single or loosely clustered. |
clustered (arching upward to semiprostrate). |
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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). |
evenly distributed or smaller and fewer distally (somewhat stiffish-succulent when fresh, proximalmost and distalmost often smaller, bractlike); petiolate; blades ovate or obovate to oblanceolate, 2–5(–7) × 1–3(–4) cm, bases ± truncate to tapered, margins laciniate to dentate or subentire. |
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Ray florets | ± 8; corolla laminae 9–15 mm. |
± 8; corolla laminae 8–12 mm. |
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Phyllaries | (± 8) ± 13 (± 21), 6–10 mm, tips usually green, rarely black. |
(± 8) ± 13 (± 21), 5–12 mm, tips green or brownish. |
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Calyculi | of 2–6 bractlets (rarely more than 2 mm). |
0 or of 1–5+ usually lance-deltate to linear, sometimes foliaceous, bractlets (lengths mostly 1/5–1/2 phyllaries). |
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Heads | 10–30(–60) in corymbiform to subracemiform arrays. |
1–5+. |
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Cypselae | glabrous. |
glabrous or strigose-hirtellous, at least on angles. |
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2n | = 40, 80. |
= 40, 40+, 80. |
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Senecio triangularis |
Senecio fremontii |
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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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CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC
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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 4 (4 in the flora). The varieties are distinguished by morphologic tendencies plus their geographic ranges. (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. 564. | ||||||||||||
Parent taxa | ||||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | S. gibbonsii, S. saliens, S. triangularis var. angustifolius | S. ductoris | ||||||||||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 332, plate 115. (1834) | Torrey & A. Gray: Fl. N. Amer. 2: 445. (1843) | ||||||||||||
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