Campanula rotundifolia L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Perennial, 1–8 dm, glabrous or inconspicuously hispidulous; basal lvs petiolate, often with broadly ovate to subrotund or cordate-rotund, angular-toothed blade to 2 cm, sometimes merely oblanceolate, often deciduous; cauline lvs ± numerous, commonly linear or nearly so, 1.5–8 cm, seldom 1 cm wide; fls typically several or rather many in a lax, racemiform or elongate- paniculiform infl, solitary in depauperate or subalpine specimens; cal-lobes 4–12 mm; cor blue, 1.5–3 cm, campanulate, the lobes much shorter than the tube; style not exceeding the cor; fr nodding, opening near the base; 2n=34, 56, 68, 102, etc. Dry woods, meadows, cliffs, and beaches; circumboreal, s. in Amer. to N.J., Ind., Io. and Mex. June–Sept.