Recorded from British Columbia by Merilees (2008) from Hardy Bay (Port Hardy) "just off Masterman Islands", collected June 7, 1996 (
Forsyth 2013,
Merillees2008). Merilees says "The presence of the Commarginal Bittersweet at Hardy Bay extends the range of this species southward from 54.8 degrees North to 50.45 degrees North, a distance of approximately 485 km, and provides the first record for this species from British Columbia and a new species
for Canada."