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

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

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #86504)

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Distribution of Ionactis stenomeres
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

Habitat / Range

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

Source: The Illustrated Flora of British Columbia


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) 1008 1617 2179
Slope Gradient (%) 0 19 37
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
70 166 229
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 4
Modal Nutrient Regime
Number 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)


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

Aster stenomeres A. Gray

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References