Senecio hydrophiloides Rydb.
sweet-marsh butterweed (tall groundsel)
Asteraceae (Aster family)
Introduction to Vascular Plants
sweet-marsh butterweed (tall groundsel)
Asteraceae (Aster family)
Introduction to Vascular Plants
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Species Information
General:
Perennial herb from a fibrous root; stems erect, solitary to several, branched above, glabrous, 0.3-1 m tall.
Leaves:
Basal leaves thickish, somewhat succulent, elliptic or broadly oblanceolate, stalked, sharply toothed, 12-35 cm long including the stalks, 2-7 cm wide, glabrous; stem leaves similar, progressively reduced upwards, becoming unstalked and lanceolate.
Flowers:
Heads with ray and disk flowers, several in an open or clustered inflorescence; involucres 5-10 mm tall; involucral bracts lanceolate, with long-pointed, conspicuously black tips; bracteoles few, black-tipped; ray flowers yellow, 1-8 or sometimes lacking, 5-10 mm long; disk flowers yellow.
Fruits:
Achenes oblong, nerved, glabrous; pappus of white hairlike bristles.
Notes:
The two weak varieties previously recognized by Douglas (1982) and Douglas et al. (1989) and others have recently been merged by Barkley (1994). The latter treatment has been followed here.
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.
Illustration Source: The Illustrated Flora of British Columbia
USDA Species Characteristics
Flower Colour:
Yellow
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source: The USDA
Ecology
Ecological Framework for Senecio hydrophiloides
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)
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) |
1159 | 730 | 1540 |
| Slope
Gradient (%) |
9 | 0 | 24 |
|
Aspect (degrees) |
109 | 60 | 360 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 1 | 7 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
6 | ||
| Modal
BEC Zone Class |
ICH | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
ICH(2), IDF(1), MS(1), PP(1), SBPS(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Wet to moist meadows and forest openings in the montane and lower subalpine zones; rare in SE BC; E to AB and S to ID and OR.Status Information
Synonyms
Synonyms and Alternate Names:
Senecio foetidus J.T. Howell
Senecio foetidus var. foetidus
Senecio foetidus var. hydrophiloides (Rydb.) T.M. Barkley ex Cronquist
Senecio pereziifolius Rydb.