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

Senecio megacephalus Nutt.
large-headed groundsel (rocky ragwort)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #66764)

E-Flora BC Static Map
Distribution of Senecio megacephalus
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Species Information

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General:
Perennial herb from a stout, woody stem-base or short rhizome; stems erect, solitary, simple or rarely few-branched above, nearly glabrous to sparsely or moderately white woolly-hairy, 20-50 cm tall.
Leaves:
Basal leaves thick, lanceolate, oblanceolate or narrowly elliptic, stalked, 6-20 cm long including the stalk, 0.5-3 cm wide, entire or sometimes callous-toothed, cobwebby-hairy when young but nearly glabrous at flowering time; stem leaves similar, lanceolate, progressively reduced upwards, becoming unstalked.
Flowers:
Heads with ray and disk flowers, solitary or rarely 2-4 on stalks, sparsely to densely white-woolly; involucres 10-16 mm tall; involucral bracts oblanceolate to lanceolate, densely white woolly-hairy and long-hairy, margins translucent, black-tipped; bracteoles numerous, sometimes nearly as long as the involucral bracts, black tipped; ray flowers orange, mostly 15-22 mm long; disk flowers yellow.
Fruits:
Achenes oblong, nerved, glabrous; pappus of white hairlike bristles.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry rocky slopes, meadows and forest openings in the montane to lower alpine zones; locally infrequent in SE BC; E to SW AB and S to MT and ID.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Senecio megacephalus

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 2036 2562
Slope Gradient (%) 1 51 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 134 260
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 2 4
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
15
Modal BEC Zone Class
AT
All BEC Zones (# of stations/zone) species was recorded in: AT(13), IDF(2)

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References