Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Atlantic Coast.
Habitat: Dry, open areas, often where disturbed.
Flowers: June-August
Origin: Introduced from the Great Plains
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Helianthus petiolaris ssp. petiolaris in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Helianthus petiolaris ssp. petiolaris checklist entry
OregonFlora: Helianthus petiolaris ssp. petiolaris information
E-Flora BC: Helianthus petiolaris ssp. petiolaris atlas page
CalPhotos: Helianthus petiolaris ssp. petiolaris photos