Senecio integerrimus |
Senecio hydrophilus |
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lambstongue ragwort, mountain butterweed, one-stem butterweed, tall western groundsel, western groundsel |
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
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Habit | Perennials (possibly biennials), (10–)20–70 cm (caudices buttonlike, roots fleshy-fibrous). | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). | ||||||||||||||||
Herbage | arachnose, loosely tomentose, or villous (hairs crisped, jointed), glabrescent. |
(often sea-green, usually glaucous) glabrous. |
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Stems | single. |
single or 2–4 loosely 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). |
progressively reduced distally; ± petiolate; blades elliptic to oblanceolate, 5–20+ × (1–)2–10 cm, bases tapered, margins denticulate or entire (mid and distal leaves sessile, 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) ca. 5; corolla laminae 3–5 mm. |
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Phyllaries | usually ± 13 or ± 21, rarely ± 8, (4–)5–12(–15) mm, tips usually black, sometimes green. |
± 8 or ± 13, 5–8 mm, tips frequently black. |
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Calyculi | of 1–5+ linear to filiform bractlets (seldom more than 2 mm). |
of 2–4+ bractlets (less than 2 mm). |
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Heads | 6–20(–40+) in corymbiform arrays (peduncle of terminal head often shorter than others). |
20–40(–80+) in compound corymbiform arrays. |
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Cypselae | usually glabrous, sometimes hirtellous (mostly on angles). |
glabrous. |
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2n | = 40, 80. |
= 40. |
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Senecio integerrimus |
Senecio hydrophilus |
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Phenology | Flowering spring–early summer. | |||||||||||||||||
Habitat | Marshes, swampy places, standing water, alkaline sites | |||||||||||||||||
Elevation | (0–)200–2500 m ((0–)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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CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
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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.) |
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Key |
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Source | FNA vol. 20, p. 556. | FNA vol. 20, p. 557. | ||||||||||||||||
Parent taxa | Asteraceae > tribe Senecioneae > Senecio | Asteraceae > tribe Senecioneae > Senecio | ||||||||||||||||
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Subordinate taxa | ||||||||||||||||||
Synonyms | S. hydrophilus var. pacificus | |||||||||||||||||
Name authority | Nuttall: Gen. N. Amer. Pl. 2: 165. (1818) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) | ||||||||||||||||
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