An Ozarkian perennial with 6-20 fls per node, the cor 2 cm, the tube well exsert from the canescent cal, scarcely reaches our range as a native, but is occasionally found as an escape. (S. azurea var. grandiflora)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.