Senecio hydrophilus |
Senecio soldanella |
|
---|---|---|
alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort |
Colorado ragwort |
|
Habit | Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous). | Perennials, 5–15(–20) cm (caudices branched, fibrous-rooted, roots fleshy). |
Herbage | (often sea-green, usually glaucous) glabrous. |
glabrous (or with hairs on peduncles). |
Stems | single or 2–4 loosely clustered. |
single (often purplish-tinged). |
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 basal; petiolate (petioles ± winged, lengths 1–3+ blades); blades broadly ovate to ovate-orbiculate, (1.5–)2.5–4.5(–6) × 1.5–4(–5) cm, bases truncate or tapered, margins weakly dentate or repand-denticulate to subentire (cauline leaves smaller, bractlike). |
Ray florets | (0) ca. 5; corolla laminae 3–5 mm. |
± 13+; corolla laminae 10–14 mm. |
Phyllaries | ± 8 or ± 13, 5–8 mm, tips frequently black. |
± 21, (8–)10–16 mm, tips green. |
Calyculi | of 2–4+ bractlets (less than 2 mm). |
of 3–5+ lanceolate to lance-linear bractlets (lengths 1/2–2/3 phyllaries). |
Heads | 20–40(–80+) in compound corymbiform arrays. |
nodding, 1(–2). |
Cypselae | glabrous. |
glabrous. |
2n | = 40. |
|
Senecio hydrophilus |
Senecio soldanella |
|
Phenology | Flowering spring–early summer. | Flowering summer. |
Habitat | Marshes, swampy places, standing water, alkaline sites | Talus slopes |
Elevation | (0–)200–2500 m ((0–)700–8200 ft) | 3200–4000 m (10500–13100 ft) |
Distribution |
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
|
CO; NM
|
Source | FNA vol. 20, p. 557. | FNA vol. 20, p. 552. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | S. hydrophilus var. pacificus | Ligularia soldanella |
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841) | A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 67. (1864) |
Web links |
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