A perennial herb with very slender, weak stems, reclining or diffusely spreading, rough with short, retrorse bristles, leafy and paniculately branched, 6 inches to 3 feet long. Leaves lanceolate or linear-lanceolate, sessile, rough on the margins and midrib, pointed at both ends, one-half to 11/2 inches long and not more than one-fourth of an inch wide. Flowers white or very faintly tinged with blue, on threadlike stalks chiefly terminating the widely divergent leafy branches; buds nodding. Calyx lobes triangular, half the length of the deeply five-cleft, bell-shaped corolla which is about one-third of an inch long; style not projecting beyond the corolla. Fruit a small, nearly globose, erect capsule, opening at maturity near the base.
In grassy swamps and marshes, from Maine to Georgia, west to Colorado and Kentucky. Flowering from June to August. In habit it resembles some of the Bedstraws (Galium).
The Blue Marsh Bellflower (Campanula uliginosa Rydberg) is similar; flowers blue with darker veins, cleft into lanceolate lobes.
Memoir 15 N. Y. State Museum
A. Marsh Or Bedstraw Bellflower - Campunula aparinoides