Senecio hydrophilus |
Senecio crassulus |
|
---|---|---|
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
mountain meadow butterweed, thick-leaf groundsel, thick-leaf ragwort |
|
Habit | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). | Perennials, (15–)20–50(–70) cm (rhizomes branched, ± woody). |
Herbage | (often sea-green, usually glaucous) glabrous. |
glabrous. |
Stems | single or 2–4 loosely clustered. |
1–(2–4). |
Leaves | 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). |
(thickish-turgid) progressively reduced distally; petiolate; blades broadly lanceolate to subelliptic, 2.5–15 × 1–5 cm, bases tapered, margins sharply dentate to subentire (some teeth callous; mid leaves sometimes larger than proximal; distal leaves sessile, smaller, often clasping). |
Ray florets | (0) ca. 5; corolla laminae 3–5 mm. |
± 8 or ± 13; corolla laminae 5–12 mm. |
Phyllaries | ± 8 or ± 13, 5–8 mm, tips frequently black. |
(± 8) ± 13 or ± 21, 5–9 mm, tips black (villous). |
Calyculi | of 2–4+ bractlets (less than 2 mm). |
of (1–)3–6 linear to filiform bractlets (lengths to 1/3 phyllaries). |
Heads | 20–40(–80+) in compound corymbiform arrays. |
(1–)4–12 in corymbiform arrays. |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. |
Senecio hydrophilus |
Senecio crassulus |
|
Phenology | Flowering spring–early summer. | Flowering summer. |
Habitat | Marshes, swampy places, standing water, alkaline sites | Moist to drying hillsides, meadows, other open places in forest associations |
Elevation | (0–)200–2500 m ((0–)700–8200 ft) | 2200–3700 m (7200–12100 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
|
CO; ID; MT; NM; NV; OR; SD; UT; WY
|
Source | FNA vol. 20, p. 557. | FNA vol. 20, p. 551. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. hydrophilus var. pacificus | S. lapathifolius, S. semiamplexicaulis |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) | A. Gray: Proc. Amer. Acad. Arts 19: 54. (1883) |
Web links |
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