Senecio integerrimus |
Senecio lugens |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
black-tip groundsel, small blacktip ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials, (10–)20–35(–50) cm (rhizomes suberect to creeping). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
loosely, often unevenly, floccose-tomentose, glabrescent. |
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Stems | single. |
single or clustered. |
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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). |
reduced distally; petiolate; blades narrowly obovate to oblanceolate, (4–)8–18(–25) cm, bases tapered, margins subentire to dentate (denticles callous; mid and distal leaves bractlike, clasping). |
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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). |
(± 5) ± 8 (± 13); corolla laminae 8–10(–15) mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
(± 8) ± 13 (± 21), 4–7 mm, tips black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 2–5 linear bractlets (1–2 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
(2–)7–12(–20+) in corymbiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
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2n | = 40, 80. |
= 40, 80. |
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Senecio integerrimus |
Senecio lugens |
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Phenology | Flowering summer. | |||||||||||||||||
Habitat | Moist meadows, gravelly streambeds, open woods in alpine or boreal sites | |||||||||||||||||
Elevation | 200–2500 m (700–8200 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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AK; MT; WA; WY; AB; BC; NT; YT
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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 lugens varies greatly in robustness across its range. It is scattered widely in the Rocky Mountain uplift and adjacent regions from northern Wyoming to Alaska; it is disjunct in the Olympic Peninsula, Washington. Superficially similar to S. integerrimus, S. lugens has well-developed, coarse, spreading rootstocks with branching roots; S. integerrimus arises from foreshortened, buttonlike caudices with abundant unbranched, fleshy-fibrous roots. (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. 554. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | S. glaucescens, S. imbricatus, S. integerrimus var. lugens | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Richardson: in J. Franklin et al., Narr. Journey Polar Sea, 748. (1823) | ||||||||||||||||
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