Senecio integerrimus |
Senecio integerrimus var. integerrimus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
lambstongue ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | |||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous or glabrescent at flowering (except in leaf axils and among heads). |
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Stems | single. |
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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). |
basal and proximal cauline distinctly petiolate; blades (cauline) elliptic, lanceolate, or oblanceolate. |
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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). |
5–8+; corollas yellow, laminae 6–8+ mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
linear-subulate, 6–7(–8) mm, tips usually green, minutely, if at all, black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(3–)8–20+. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
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2n | = 40, 80. |
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Senecio integerrimus |
Senecio integerrimus var. integerrimus |
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Phenology | Flowering spring. | |||||||||||||||||
Habitat | Open prairies and plains | |||||||||||||||||
Elevation | 200–1500 m (700–4900 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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CO; IA; KS; MN; MT; ND; NE; NM; SD; WY; AB; MB; SK |
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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.) |
Variety integerrimus intergrades with var. exaltatus in the Rocky Mountains. (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. 556. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio > Senecio integerrimus | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | unknown | ||||||||||||||||
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