Bellflower family (Campanulaceae)
Description: This native plant is an annual or biennial from 2-6' tall. Usually, it is unbranched, although sometimes a few side stems will develop from the lower central stem. The central stem is more or less hairy. The alternate leaves are up to 6" long and 2" across, tapering to slender petioles. They are lanceolate to ovate, with serrated margins and a rough upper surface. The central stem terminates in a spike of flowers about ½2' long. From the axils of the upper leaves, secondary spikes of flowers may develop, but these are much shorter (about 16" in length). Each flower is about 1" across, and varies in color from light to dark violet-blue, depending on the local ecotype. The corolla has 5 spreading lobes that are divided nearly to the base; they have a satiny appearance under bright light, and tend to have margins that twist and curl. In the center of the flower is the top of a 5-angled ovary, from which a light violet style is strongly exerted. This style bends downward from the flower, but curls upward near its tip; the small stigma is white and divided into 3 lobes. The flower is often white toward the center, rather than blue-violet. The green tubular calyx is strongly ridged and has 5 long narrow teeth that curl backward when the flower opens. The blooming period occurs from mid-summer to early fall, and lasts about 1½ months. The seed capsule is 5-angled and rather flat-topped. The root system consists of a taproot.
Cultivation: The preference is light shade to partial sun, moist to mesic conditions, and a rich loamy soil. During a drought, this plant often drops its lower leaves. Depending on moisture conditions and the fertility of the soil, the size of this plant can be highly variable.
Range & Habitat: American Bellflower is a common plant that occurs in most counties of Illinois (see Distribution Map). Habitats include moist to slightly dry deciduous woodlands, woodland borders, and thickets. It is often found along woodland paths, and appears to prefer slightly disturbed areas.
Faunal Associations: Long-tongued bees are the primary pollinators of the flowers, including bumblebees and large Leaf-Cutting bees (Megachilidae). Among the latter, is the oligolectic bee Megachile campanulae campanulae. Other visitors of the flowers include Halictid bees, butterflies, and skippers. These insects seek nectar, and some of the bees collect pollen from the anthers. Syrphid flies may feed on the pollen, but they are not effective pollinators. Deer occasionally eat the flowers and foliage.
Photographic Location: The edge of a wooded area at Crystal Lake Park in Urbana, Illinois.
Comments: Sometimes this plant is called "Tall Bellflower." The older scientific name is Campanula americana, but it has been reassigned to its own genus because of the unique structure of the flowers. The flowers of this tall-growing plant are showy, but individually short-lived. However, new flowers are produced in succession higher up on the spike. The other members of the Bellflower family that occur in Illinois, whether native or introduced, have bell-shaped flowers, while the flowers of the American Bellflower have a more open design with widely spreading lobes. Consequently, this species is easy to identify.