Senecio integerrimus |
Senecio scorzonella |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Sierra groundsel, Sierra ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, 10–40(–50) cm (rhizomes stout). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
closely lanate to floccose-tomentose, unevenly glabrescent. |
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Stems | single. |
usually single, rarely clustered. |
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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; obscurely petiolate; blades oblanceolate to lanceolate, (4–)6–12+ × (1–)1.5–3 cm, bases tapering to winged petioles, margins dentate to denticulate (denticles dark, cartilaginous; mid and distal leaves smaller, 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). |
usually ± 5, sometimes 0; corolla laminae 5–8(–10) mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 13, 3–5 mm, tips usually black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
0 or of 1–3+ lance-deltate to lance-linear bractlets (mostly less than 1 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(10–)14–24(–30+) in corymbiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
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2n | = 40, 80. |
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Senecio integerrimus |
Senecio scorzonella |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Open wooded areas and subalpine meadows | |||||||||||||||||
Elevation | 1600–3500 m (5200–11500 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
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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.) |
Senecio scorzonella is restricted to high elevations in the Sierra Nevada–Cascade uplift and the White Mountains of California; it barely enters adjacent Nevada. (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. 554. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | S. covillei, S. covillei var. scorzonella | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Greene: Pittonia 3: 90. (1896) | ||||||||||||||||
Web links |
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