Morphology A large central flower stem shoots up from a
basal rosette, which is a circular arrangement of leaves. Flowers grow off short stems connected to the central stalk, known as a
raceme. The plant's overall height ranges from . The central stem is light green, slightly grooved, and hairy. The primary root system is a
taproot. It has
alternate leaves in length, that are lance-shaped to ovate-elliptic in shape, with rough/toothed edges. American bellflower
flowers range in color from light blue to violet with a pale white ring at the throat of the flower. The flowers primarily bloom in the summer months of June, July and August. It is an unusual
bellflower in that its flowers are flat, rather than its namesake bell shape.
Reproduction and Life History The American bellflower is
self-compatible and exhibits sequential
hermaphroditism as a
protandrous plant. Mating strategies are plastic, meaning they can adapt with changes in the environment, and dependent on pollinator abundance. When there are
pollinators present in substantial numbers, the American bellflower reproduces via
out-crossing, a reproduction strategy of breeding between different individuals. When there are low numbers of pollinators visiting, the plants are able to
self-pollinate.
Pollen ranges in color from dark purple to light tan. The fruiting bodies are capsules, displayed from August to March, and contain many seeds. The amount of light and nutrients the
maternal plant receives influences their offspring's germination timing. This germination timing from the maternal tissue in turn informs the
life history strategy of the American bellflower, as it controls if the offspring will be an
annual or
biennial plant. Seeds that
germinate in the fall produce
annual plants and spring-germinating seeds produce
biennial plants. Binneal plants produce a
basal rosette in the first year, and bloom in the second year from a tall stalk that grows from the basal rosette. == Taxonomy ==