Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California; also in eastern North America.
Habitat: Roadsides, cliffs, embankments, fields, parks, forest edge, wastelots, and other disturbed areas.
Flowers: May-July
Origin: Introduced from Turkey and Bulgaria
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Hypericum calycinum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Hypericum calycinum checklist entry.
E-Flora BC: Hypericum calycinum atlas page.
CalPhotos: Hypericum calycinum photos.
USDA Plants: Hypericum calycinum information.