Senecio integerrimus |
Senecio pseudoarnica |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
beach groundsel, seaside ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, (15–)20–60(–100) cm (caudices erect). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
arachno-tomentose to sericeous-lanate (especially on abaxial faces of phyllaries), unevenly glabrescent. |
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Stems | single. |
single (turgid). |
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Leaves | progressively reduced distally; ± petiolate; blades elliptic, lanceolate, linear, oblanceolate, rounded-deltate, or suborbiculate, 6–25 × 1–6 cm, bases ± tapered or truncate to cordate, margins entire or ± dentate (distal leaves sessile, bractlike). |
evenly distributed (proximal withering before flowering); subsessile or petiolate; blades obovate to oblanceolate, 5–15(–25) × 2–6(–10) cm, bases tapered, margins serrate-dentate to denticulate or subentire (distal leaves slightly smaller). |
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Ray florets | usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
usually ± 21, rarely 0; corolla laminae 20–25 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 21, 8–15 mm (sometimes purplish or pinkish-tinged), tips greenish. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 6–10 linear bractlets (longest nearly equaling phyllaries). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
1–5(–15+) in corymbiform arrays (involucres notably large, 20–40 mm diam.). |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio pseudoarnica |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Sandy-gravelly ocean shores and upper beaches | |||||||||||||||||
Elevation | 0 m (0 ft) | |||||||||||||||||
Distribution |
CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; SK
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AK; ME; BC; NB; NL; NS; QC; SPM; ne Asia |
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Discussion | Varieties 5 (5 in the flora). The varieties of Senecio integerrimus are distinguished by morphology and geography. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Rayless individuals of Senecio pseudoarnica have been recognized as var. rollandii or forma rollandii (Victorin) Fernald; they are not otherwise distinctive. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 568. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | Arnica maritima, S. pseudoarnica var. rollandii, S. rollandii | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Lessing: Linnaea 6: 240. (1831) | ||||||||||||||||
Web links |
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