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