Senecio sacramentanus |
Senecio hydrophilus |
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Sacramento ragwort |
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
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Habit | Perennials, 20–50 cm (caudices fibrous-rooted). | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). |
Herbage | sparsely pubescent to tomentose (especially on abaxial leaf faces and among heads). |
(often sea-green, usually glaucous) glabrous. |
Stems | single or loosely clustered. |
single or 2–4 loosely clustered. |
Leaves | progressively reduced distally; petiolate; blades triangular, triangular-lanceolate, or lanceolate, 3–10(–15) × 1.5–4 cm, bases cordate to truncate or tapered, margins serrate or dentate (mid and 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). |
Ray florets | 0. |
(0) ca. 5; corolla laminae 3–5 mm. |
Phyllaries | ± 8, 6–9 mm, tips green. |
± 8 or ± 13, 5–8 mm, tips frequently black. |
Calyculi | of 2–5+ lance-deltate to filiform bractlets (lengths 1/5–1/2 phyllaries). |
of 2–4+ bractlets (less than 2 mm). |
Heads | nodding, 6–10+ in racemiform-paniculiform arrays. |
20–40(–80+) in compound corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
|
Senecio sacramentanus |
Senecio hydrophilus |
|
Phenology | Late summer. | Flowering spring–early summer. |
Habitat | Montane meadows | Marshes, swampy places, standing water, alkaline sites |
Elevation | 3000–3500 m (9800–11500 ft) | (0–)200–2500 m ((0–)700–8200 ft) |
Distribution |
NM |
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
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Source | FNA vol. 20, p. 550. | FNA vol. 20, p. 557. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. hydrophilus var. pacificus | |
Name authority | Wooton & Standley: Contr. U.S. Natl. Herb. 16: 194. (1913) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) |
Web links |
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