Senecio integerrimus |
Senecio integerrimus var. exaltatus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Columbia Mountain butterweed, Columbia ragwort, lambs-tongue groundsel, one-stem butterweed, tall western groundsel, western groundsel |
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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. |
copiously to sparsely arachnose, tomentose, or villous at flowering. |
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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 usually indistinctly petiolate; blades (cauline) mostly elliptic to lanceolate or oblanceolate, sometimes rounded-deltate or suborbiculate. |
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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 ± 5, sometimes 0; corollas yellow, laminae 6–15 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± lanceolate, (4–)5–10 mm, tips 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). |
6–15(–30+). |
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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. exaltatus |
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Phenology | Flowering spring. | |||||||||||||||||
Habitat | Open woodlands, sagebrush plains, meadow grasslands from foothills to above timberline | |||||||||||||||||
Elevation | 500–3200 m (1600–10500 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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CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; 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 exaltatus is the most widespread and variable variety of the species. Eradiate plants of var. exaltatus have been recognized as var. vaseyi; there appears to be no populational integrity to the eradiate condition. (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. 557. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio > Senecio integerrimus | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | S. exaltatus, S. dispar, S. hookeri, S. integerrimus var. vaseyi, S. lugens var. exaltatus, S. perplexus, S. vaseyi | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | (Nuttall) Cronquist: Leafl. W. Bot. 6: 48. (1950) | ||||||||||||||||
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