Senecio sheldonensis |
Senecio hydrophilus |
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Mount Sheldon butterweed, Mount Sheldon ragwort, Mt. Sheldon ragwort |
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
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Habit | Perennials, 30–40(–50) cm (caudices branched, fibrous-rooted). | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). |
Herbage | glabrous or with scattered hairs near leaf bases and among heads. |
(often sea-green, usually glaucous) glabrous. |
Stems | single or loosely clustered. |
single or 2–4 loosely clustered. |
Leaves | evenly distributed; petiolate or subsessile; blades lanceolate, 4–10 × 2–4 cm, bases ± tapered, margins denticulate (distal leaves sessile, smaller). |
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). |
Ray florets | ± 8; corolla laminae ± 10 mm. |
(0) ca. 5; corolla laminae 3–5 mm. |
Phyllaries | ± 13, 7–10 mm, tips black (hairy). |
± 8 or ± 13, 5–8 mm, tips frequently black. |
Calyculi | of 3–7 bractlets (0.5–3 mm). |
of 2–4+ bractlets (less than 2 mm). |
Heads | (1–)3–5(–6) in cymiform arrays. |
20–40(–80+) in compound corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
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Senecio sheldonensis |
Senecio hydrophilus |
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Phenology | Flowering late Jul–mid Aug. | Flowering spring–early summer. |
Habitat | Subalpine meadows and valleys | Marshes, swampy places, standing water, alkaline sites |
Elevation | 1200–1800 m (3900–5900 ft) | (0–)200–2500 m ((0–)700–8200 ft) |
Distribution |
BC; NT; YT |
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
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Discussion | Senecio sheldonensis is infrequently collected and poorly understood. The treatment here is provisional. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 567. | FNA vol. 20, p. 557. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. hydrophilus var. pacificus | |
Name authority | A. E. Porsild: Canad. Field-Naturalist 64: 43. (1950) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) |
Web links |
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