Senecio hydrophilus Nutt.
alkali-marsh butterweed (water ragwort)
Asteraceae (Aster family)

Introduction to Vascular Plants

Photograph

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Map

E-Flora BC Static Map

Distribution of Senecio hydrophilus
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Species Information

General:
Perennial herb from a fibrous-rooted short crown; stems erect, usually solitary, much branched above, hollow, glaucous, glabrous, 0.4-2 m tall.
Leaves:
Basal leaves thick, somewhat succulent, 20-50 cm long including the stalk, 2-5 cm wide, narrowly oblanceolate to elliptic, entire, sometimes irregularly callous-toothed; stem leaves few, progressively reduced upwards, becoming unstalked.
Flowers:
Heads with ray and disk flowers, numerous in a clustered inflorescence; involucres 5-8 mm tall; involucral bracts lanceolate, with long-pointed, usually black tips, glabrous; bracteoles few, black-tipped; ray flowers few, yellow, 4-8 mm long or rarely lacking.
Fruits:
Achenes oblong, glabrous; pappus of white hairlike bristles.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

Ecological Framework for Senecio hydrophilus

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Avg

Min

Max

Elevation (metres)
1645 1080 2210
Slope Gradient (%)
32 29 35

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

185 180 190
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 4 4
Modal Nutrient Regime
Class
D
# of field plots
 species was recorded in:
2
Modal BEC Zone Class
IDF

All BEC Zones (# of stations/zone) species was recorded in

ESSF(1), IDF(1)

Habitat and Range

Wet, often alkaline swamps and meadows in the montane zone; rare in extreme SE BC, known only from Salmon River and Kootenay River; E to SD and S to WA and CO.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Senecio sandvicensis auct. non Less.