Senecio crassulus |
Senecio integerrimus |
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mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
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Habit | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | ||||||||||||||||
Herbage | glabrous. |
arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
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Stems | 1–(2–4). |
single. |
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Leaves | (thickish-turgid) progressively reduced distally; petiolate; blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, often clasping). |
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). |
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Ray florets | ± 8 or ± 13; corolla laminae 5–12 mm. |
usually ± 8 or ± 13, sometimes 0; corolla laminae 6–15(–20) mm (usually yellow, ochroleucous to white in one variety). |
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Phyllaries | (± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
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Calyculi | of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
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Heads | (1–)4–12 in corymbiform arrays. |
6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
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Cypselae | glabrous. |
usually glabrous, sometimes hirtellous (mostly on angles). |
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2n | = 40. |
= 40, 80. |
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Senecio crassulus |
Senecio integerrimus |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Moist to drying hillsides, meadows, other open places in forest associations | |||||||||||||||||
Elevation | 2200–3700 m (7200–12100 ft) | |||||||||||||||||
Distribution |
CO; ID; MT; NM; NV; OR; SD; UT; WY
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CA; CO; IA; ID; KS; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WY; AB; BC; 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.) |
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Key |
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Source | FNA vol. 20, p. 551. | FNA vol. 20, p. 556. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. lapathifolius, S. semiamplexicaulis | |||||||||||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | ||||||||||||||||
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