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

Introduction to Vascular Plants

Photograph

© Ryan Batten     (Photo ID #66764)


Map

E-Flora BC Static Map

Distribution of Senecio megacephalus
Click here to view the full interactive map and legend

Species Information

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.

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 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

Avg

Min

Max

Elevation (metres)
2036 1080 2562
Slope Gradient (%)
51 1 100

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

134 45 260
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 1 4
Modal Nutrient Regime
Class
D
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia