Territory:
Rare and very localized we can find the Flax-leaved aster around Trois-Rivieres (Mauricie), and in the region of the Capitale-Nationale and Centre-du-Québec.
Habitat:
Two very different habitats: 1) Dry sandy open, almost always in association with jack pine (occurrences of Trois-Rivières). 2) Coastal cliffs composed of acid rocks (gneiss) located near waterfalls or rapids.
Flowering:
In bloom in late August, September and early October.
Similar:
Other Asters with blue/violet flower as the Purple-stemmed aster (Symphyotrichum puniceum) and the New England aster (Symphyotrichum novae-angliae) or the Heart-leaved aster (Symphyotrichum cordifolium), but the Flax-leaved aster is easily distinguished by its linear leaves reminiscent of savory leaves.
The Bog aster (Oclemena nemoralis) with purple/pink flower and linear-oblong leaves is the one that resembles it the most, it is distinguished by its habitat because, as its name suggests, it is found in bogs or highly acidic environments. In addition, the leaves of the Flax-leaved aster have subulate tip (very sharp) that do not have leaves of the Bog aster.