Senecio integerrimus |
Senecio spartioides |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
broom groundsel, broom senecio, broom-like ragwort, grass-leaf ragwort, many-head groundsel |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Subshrubs, 20–120+ cm (taproots forming woody crowns). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
usually glabrous, sometimes sparsely, unevenly hairy. |
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Stems | single. |
usually multiple (branching and arching upward). |
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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 (proximal often smaller); sessile or obscurely petiolate; blades narrowly linear to filiform (or parted into linear-filiform lobes), 5–10 cm × 1–6 mm, bases ± linear, ultimate margins entire. |
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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 (± 13); corolla laminae 8–12 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
usually ± 8, sometimes ± 13, (5–)6–9(–10) mm, tips green or minutely black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
0 or of 1–3+ (minute, inconspicuous) bractlets. |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
10–20(–60) in compound corymbiform arrays (involucres cylindric or narrowly campanulate, 3–6 mm diam.). |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
usually hirtellous, sometimes glabrous. |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio spartioides |
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Phenology | Flowering summer–fall. | |||||||||||||||||
Habitat | Open, dry disturbed sites, especially stream banks and hillsides | |||||||||||||||||
Elevation | 1000–3500 m (3300–11500 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; CA; CO; NE; NM; NV; SD; TX; UT; WY
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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.) |
Plants with the leaves parted into lobes that are seldom more than 1 mm wide have been recognized as Senecio spartioides var. multicapitatus (or as S. multicapitatus); expression of the character is inconsistent throughout the range and recognition of the two entities is all but impossible to maintain. Senecio spartioides apparently hybridizes with S. eremophilus in Garfield County, Utah, and perhaps elsewhere (cf., Holmgren, Reveal, and LaFrance 3463, BRY, KSC, NY). The name Senecio toiyabensis rests upon materials that suggest introgression with S. fremontii. Some specimens usually referred to 41. S. pattersonensis suggest introgression with S. spartioides. (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. 559. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
Sibling taxa | ||||||||||||||||||
Subordinate taxa | ||||||||||||||||||
Synonyms | S. andersonii, S. incurvus, S. multicapitatus, S. serra var. sanctus, S. spartioides var. granularis, S. toiyabensis | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Torrey & A. Gray: Fl. N. Amer. 2: 438. (1843) | ||||||||||||||||
Web links |
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