Senecio integerrimus |
Senecio squalidus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
oxford ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Annuals (or perennials), 15–60+ cm (taprooted). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
sparsely, unevenly floccose to subglabrous, glabrescent. |
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Stems | single. |
single (branching distally). |
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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). |
evenly distributed; petiolate (proximal, petioles ± winged); blades obovate to oblong, 4–10 × 2–4+ cm, mostly lyrate-pinnatifid to pinnate, bases tapered, ultimate margins dentate (distal leaves similar, smaller, sessile). |
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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 5–8 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 13) ± 21, 5–6+ mm, tips black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 4–10+ bractlets (1–2+ mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(3–)6–20 in open, cymiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
usually hairy. |
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2n | = 40, 80. |
= 20. |
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Senecio integerrimus |
Senecio squalidus |
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Phenology | Flowering late winter–spring or fall. | |||||||||||||||||
Habitat | Disturbed sites (in regions of cool, damp climates) | |||||||||||||||||
Elevation | 0–300 m (0–1000 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; NS; Europe [Introduced in North America] |
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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 squalidus is native in Europe, where it is a common weed. It is apparently established in the San Francisco Bay area, California and has been reported from British Columbia, New Brunswick, and Nova Scotia. It is to be expected elsewhere. (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. 560. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Linnaeus: Sp. Pl. 2: 869. (1753) | ||||||||||||||||
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