American bellflower

Campanula americana

''Campanula americana'', the American bellflower, is a tall bellflower native to eastern North America from the Great Lakes region south to Florida and from the Dakotas east to New York.
American Bellflower - Campanulastrum americanum Habitat: Meadow/mixed forest edge
https://www.jungledragon.com/image/108303/american_bellflower_-_campanulastrum_americanum.html American bellflower,Campanula americana,Geotagged,Summer,United States

Appearance

This native plant is an annual or biennial from 2-6' tall. Its flowers are light blue to violet and are usually arranged in elongated clusters. It is an unusual bellflower in that its flowers are usually flat and not bell-shaped.

It has a varying life-history with seeds germinating in the fall producing annual plants and spring-germinating seeds producing biennial plants. It is generally insect-pollinated, and does not usually self-pollinate.
Tall Bellflower (Campanulastrum americanum) In a forested area near a regulation reservoir. 
https://www.jungledragon.com/image/81506/tall_bellflower_campanulastrum_americanum.html American bellflower,Campanula americana,Geotagged,Summer,United States

Naming

Some authorities, including the USDA Plants database consider the name ''Campanulastrum americanum'' to be the valid and correct name for this species.

References:

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderAsterales
FamilyCampanulaceae
GenusCampanula
SpeciesC. americana