Senecio integerrimus |
Senecio sphaerocephalus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
ball-head ragwort, marsh groundsel, mountain marsh butterweed |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, (30–)40–80 cm (rhizomes stout). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
tomentose, unevenly glabrescent. |
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Stems | single. |
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). |
reduced distally; petiolate; blades oblanceolate to elliptic, 4–12x 1–4 cm, bases tapered, margins weakly dentate or denticulate (denticles callous; mid leaves similar, smaller; distal leaves bractlike). |
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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). |
± 13; corolla laminae 6–10 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 13) ± 21, 3–7 mm, tips black or brownish. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 1–5 bractlets (longest 2–3 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(3–)5–24 in corymbiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
usually hairy, sometimes glabrous. |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio sphaerocephalus |
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Phenology | Flowering spring–early summer. | |||||||||||||||||
Habitat | Open meadows, especially in coniferous associations | |||||||||||||||||
Elevation | 1000–1800 m (3300–5900 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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ID; MT; NV; OR; UT; WY
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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.) |
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Key |
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Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 555. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. altus, S. latus, S. lugens var. hookeri | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Greene: Pittonia 3: 106. (1896) | ||||||||||||||||
Web links |
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