Ionactis stenomeres (A. Gray) Greene
Rocky Mountain aster
Asteraceae (Aster family)

Introduction to Vascular Plants


© Bryan Kelly-McArthur     (Photo ID #86504)


E-Flora BC Static Map

Distribution of Ionactis stenomeres
Click here to view the full interactive map and legend

Species Information

Perennial herb from a fibrous-rooted, branched, woody stem-base; stems ascending to erect, simple, long-hairy, 13-30 cm tall.
Basal leaves few, soon deciduous; stem leaves reduced below, the others uniform except for the reduced uppermost ones, linear with spiny tips, 1.5-4.0 cm long, 1-4 mm wide, unstalked, short, appressed-hairy, entire.
Heads with ray and disk flowers, solitary; involucres 8-13 mm tall; involucral bracts graduated, linear to lance-linear, with long-pointed tips, fine appressed-hairy with a greenish or sometimes purplish midline and more or less papery margin; ray flowers 13, sometimes more, violet, 10-20 mm long; disk flowers yellow.
Achenes several-nerved, with stalked glands and fine hairs; pappus straw-colored, double, the outer bristles as much as 1 mm long.

SourceThe Illustrated Flora of British Columbia


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.


Ecological Framework for Ionactis stenomeres

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




Elevation (metres)
1617 1008 2179
Slope Gradient (%)
19 0 37

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

166 70 229
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 0 4
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

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

ESSF(6), IDF(2), MS(1), PP(1)

Habitat and Range

Dry gravelly or rocky slopes in the steppe and montane zones; infrequent in SE BC; S to MT, ID and NE WA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Aster stenomeres A. Gray