Senecio hydrophilus |
Senecio neowebsteri |
|
---|---|---|
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
Olympic Mountain ragwort |
|
Habit | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). | Perennials, 7–15(–20+) cm (rhizomes fibrous-rooted). |
Herbage | (often sea-green, usually glaucous) glabrous. |
(sometimes purplish-tinged) floccose-tomentose, unevenly glabrescent. |
Stems | single or 2–4 loosely clustered. |
single or loosely clustered (erect or arching). |
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). |
mostly cauline; petiolate (petioles about equaling blades); blades lanceolate or oblanceolate to ovate, (2–)4–8+ × 1.5–3 cm, bases tapered, margins denticulate (distal leaves smaller, lanceolate or linear-lanceolate, bractlike). |
Ray florets | (0) ca. 5; corolla laminae 3–5 mm. |
± 13; corolla laminae ± 15 mm. |
Phyllaries | ± 8 or ± 13, 5–8 mm, tips frequently black. |
usually ± 21, sometimes ± 13, (8–)10–15 mm, tips usually greenish (often sparsely hairy). |
Calyculi | of 2–4+ bractlets (less than 2 mm). |
of 4–8 lanceolate to lance-linear bractlets (lengths mostly less than 1/2 phyllaries). |
Heads | 20–40(–80+) in compound corymbiform arrays. |
nodding, 1(–2). |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
= 40. |
Senecio hydrophilus |
Senecio neowebsteri |
|
Phenology | Flowering spring–early summer. | Flowering late summer–early fall. |
Habitat | Marshes, swampy places, standing water, alkaline sites | High talus slopes |
Elevation | (0–)200–2500 m ((0–)700–8200 ft) | 2200–2600 m (7200–8500 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
|
WA
|
Discussion | Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 557. | FNA vol. 20, p. 553. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. hydrophilus var. pacificus | S. websteri |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) | S. F. Blake: Leafl. W. Bot. 8: 143. (1957) |
Web links |
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