Aster identification

(Question)

dry-moist ravine, shaded conditions, rich soil

(Answer)

There are many native Asters in Ontario and distinguishing one from another can be very difficult, especially in a ravine setting where growth habit can differ due to fluctuations in soil moisture and sunlight penetration through the tree canopy.

I believe the Aster in your photo is a Eurybia macrophylla or commonly called Large-leaved Aster.  These plants are widespread in Ontario forests and ravines.  See the link below for more information on this lovely Ontario Native Wildflower.

http://ontariobotany.com/main/species.php?id=0012

Hope this helps.