Flora of North America species comparison

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Senecio hydrophilus

alkali marsh groundsel, alkali-marsh butterweed, alkali-marsh ragwort, water groundsel, water ragwort
Habit Perennials (biennials?), 40–100(–200) cm (caudices foreshortened, roots fleshy-fibrous).
Herbage

(often sea-green, usually glaucous) glabrous.
Stems

single or 2–4 loosely clustered.
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).
Ray florets

(0) ca. 5;

corolla laminae 3–5 mm.
Phyllaries

± 8 or ± 13, 5–8 mm, tips frequently black.
Calyculi

of 2–4+ bractlets (less than 2 mm).
Heads

20–40(–80+) in compound corymbiform arrays.
Cypselae

glabrous.
2n

= 40.

Senecio hydrophilus
Phenology Flowering spring–early summer.
Habitat Marshes, swampy places, standing water, alkaline sites
Elevation (0–)200–2500 m ((0–)700–8200 ft)
Distribution
from FNA
CA; CO; ID; MT; NV; OR; SD; UT; WA; WY; BC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 20, p. 557.
Parent taxa 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
Synonyms S. hydrophilus var. pacificus
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 411. (1841)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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