Senecio integerrimus |
Senecio spribillei |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, 5–20 cm (caudices branched). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
glabrous. |
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Stems | single. |
usually single. |
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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). |
progressively reduced distally (basal and proximal withering before flowering); petiolate (petioles purplish, weakly winged, 4–5 cm); blades broadly triangular-ovate to suborbiculate, 2–4(–5) × 2.5–3 cm, bases truncate to ± cuneate, margins coarsely spinulose-dentate (mid leaves similar, persistent). |
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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). |
“few”; corolla laminae ca. 7 mm (inconspicuous, equaling or barely surpassing phyllaries). |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 13, 7–9 mm, tips green. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of “few,” linear bractlets. |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
nodding, 4–6. |
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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 spribillei |
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Phenology | Flowering Aug. | |||||||||||||||||
Habitat | Alpine rock ledges | |||||||||||||||||
Elevation | 2500 m (8200 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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MT |
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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. Senecio spribillei (from Snowshoe Peak, Cabinet Mountains) is similar in aspect to S. neowebsteri of the Olympic Mountains, Washington. (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. 551. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | W. A. Weber: Sida 20: 511, fig. 1. (2002) | ||||||||||||||||
Web links |
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