Senecio integerrimus |
Senecio arizonicus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
Arizona ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, (20–)30–40(–60) cm (rhizomes suberect or weakly spreading). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
lanate-arachnose or tomentose, unevenly glabrescent. |
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Stems | single. |
1(–2). |
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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). |
(often purplish abaxially) reduced distally; petiolate; blades ovate to subelliptic, (5–)6–10(–15) × (2.5–)3–5(–9) cm, bases tapered or contracted, margins subentire to denticulate (denticles callous; mid and 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 5–10 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 13) ± 21, 5–7 mm, tips green. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 2–5+ bractlets (largest to 3 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(2–)5–12(–20) in corymbiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
hairy (especially on angles). |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio arizonicus |
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Phenology | Flowering late spring–summer. | |||||||||||||||||
Habitat | Openings in pine-oak woodlands | |||||||||||||||||
Elevation | 1600–2100 m (5200–6900 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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AZ
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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 arizonicus is reputedly in southern New Mexico (W. C. Martin and C. R. Hutchins 1980); that seems unlikely and should be checked. (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 | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Greene: Bull. Torrey Bot. Club 10: 87. (1883) | ||||||||||||||||
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