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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
from FNA
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; ID; MT; NM; NV; OR; SD; UT; WY
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 557. FNA vol. 20, p. 551.
Parent taxa Asteraceae > tribe Senecioneae > Senecio Asteraceae > tribe Senecioneae > Senecio
Sibling taxa
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. crassulus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
S. actinella, S. amplectens, S. ampullaceus, S. aphanactis, S. arizonicus, S. aronicoides, S. astephanus, S. atratus, S. bigelovii, S. blochmaniae, S. californicus, S. cannabifolius, S. clarkianus, S. elegans, S. elmeri, S. eremophilus, S. ertterae, S. erucifolius, S. flaccidus, S. fremontii, S. hydrophiloides, S. hydrophilus, S. integerrimus, S. jacobaea, S. lemmonii, S. lugens, S. lyonii, S. megacephalus, S. mohavensis, S. multidentatus, S. neowebsteri, S. parryi, S. pattersonensis, S. pseudoarnica, S. pudicus, S. quaylei, S. rapifolius, S. riddellii, S. sacramentanus, S. scorzonella, S. serra, S. sheldonensis, S. soldanella, S. spartioides, S. sphaerocephalus, S. spribillei, S. squalidus, S. sylvaticus, S. taraxacoides, S. triangularis, S. viscosus, S. vulgaris, S. warnockii, S. wootonii
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)
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