[6] Some authorities, including the USDA PLANTS database, consider the name Campanulastrum americanum to be the accepted name for this species.

[7][8] A large central flower stem shoots up from a basal rosette, that terminates in a raceme 1/2-2' long, with the plant's overall height being 3-6'.

[9] Tall bellflower flowers are light blue to violet with a pale white ring at the throat, which primarily bloom in July and August.

Its pistils have a recurved style and a three lobed anther and each flower has 5 stamen, 5 petals, and 5 sepals.

Tall bellflowers grow from the Great Lakes region south to Florida and from the Dakotas east to New York.