Perennial; stems 3-7 dm; lvs thin, lance-linear to lance-ovate, 2-8 cm, sharply and coarsely toothed, narrowed at base to a short petiole or nearly sessile; infl widely branched, many-fld; bracts linear or subulate; fls drooping on slender pedicels; sep lance-triangular, 1.5-3 mm; cor pale blue, 6-8 mm; style exsert 3-5 mm; fr opening near the base; 2n=34. Rocky woods in the mts., chiefly at low elev.; w. Md. and e. Ky. to Ga. and Ala. July-Sept. (C. flexuosa)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.