Senecio integerrimus |
Senecio aphanactis |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
California groundsel, chaparral ragwort, rayless ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Annuals, 5–20+ cm (taproots relatively short and thin). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous or sparsely tomentose (especially distally). |
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Stems | single. |
usually 1 (relatively thin, delicate). |
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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; sessile; blades oblanceolate to lance-linear, 2–4 × 0.5–1 cm, bases sometimes weakly clasping, margins usually subpinnate to dentate, sometimes subentire (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). |
0 or 1–5; corolla laminae 0.5–1+ mm (barely surpassing phyllaries, heads perhaps technically disciform). |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 8 or ± 13, 5–6 mm, tips greenish. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
0 or of 1–3+ lance-deltate bractlets. |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
4–10+ in open, cymiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
densely hairy. |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio aphanactis |
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Phenology | Flowering late winter–spring. | |||||||||||||||||
Habitat | Dry, open ground, especially alkaline flats | |||||||||||||||||
Elevation | 10–400 m (0–1300 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; Mexico (Baja California)
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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.) |
Of conservation concern. (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. 563. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Greene: Pittonia 1: 220. (1888) | ||||||||||||||||
Web links |
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