E-Flora BC: Electronic Atlas of the Flora of British Columbia

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

Introduction to Vascular Plants
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Distribution of Senecio hydrophilus
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia

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

Minimum

Average

Maximum

Elevation (metres) 1080 1645 2210
Slope Gradient (%) 29 32 35
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
180 185 190
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 4 4
Modal Nutrient Regime
Class
D
Number 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)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Senecio sandvicensis auct. non Less.

Taxonomic and Nomenclatural Links

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General References