Parry's Bellflower, Parry's Harebell: Campanula parryi var. idahoensis - Stems slender with one to several small flowers. Flowers and fruit capsules erect. Plants glabrous.
Creeping Bellflower, Rampion Bellflower, Rover Harebell, Valley Bluebell: Campanula rapunculoides - Introduced species. Stems thick with large, showy, deep blue flowers. Flowers numerous on stems. Plants of the lowlands and often found near roadside farms or towns.
American Harebell, Bluebell Bellflower, Bluebell-of-Scotland, Scot's Bellflower, Scotch Bluebell, Roundleaf Bluebell: Campanula rotundifolia (Synonym: Campanula sacajaweana) - Fruit capsules and flowers nodding. Plants glabrous (except some minute hairs near the base).
Rough Bellflower, Rough Bluebell, Rough Harebell: Campanula scabrella - Flowers and fruit capsules erect. Plants covered with minute, spreading hairs.