Senecio integerrimus |
Senecio integerrimus var. major |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
big-head groundsel, lambs-tongue ragwort, lambstongue 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. |
usually copiously 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 distinctly petiolate; blades (cauline) usually lanceolate to 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). |
usually 5; corollas yellow, laminae mostly 5–8 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
linear-subulate, 8–12 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). |
6–12(–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. major |
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Phenology | Flowering spring. | |||||||||||||||||
Habitat | Openings in coniferous woodlands and woodland-sagebrush associations | |||||||||||||||||
Elevation | 100–3600 m (300–11800 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; NV; OR |
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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 major is most frequent in the Sierra Nevada, especially on the western slope; eastward, it passes into var. exaltatus. (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 | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. eurycephalus var. major, S. lugens var. megacephalus, S. mendocinensis, S. whippleanus | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | (A. Gray) Cronquist: Aliso 4: 100. (1958) | ||||||||||||||||
Web links |
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