Gentiana saponaria L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stems 2–7 dm, glabrous or occasionally papillate-puberulent; lvs linear to elliptic or obovate, mostly 5–10 cm, scabro-ciliolate; fls few–several in a dense terminal cluster and 1–few in the upper axils or on short lateral branches; cal-tube glabrous, the lobes ciliolate, usually narrowly oblanceolate, shorter than to about as long as the tube; cor blue at least distally, 3–5 cm, ventricose, narrowly open, the lobes usually incurved above, rounded, seldom surpassing the bifid plaits by more than 2 mm; anthers connate; 2n=26. Moist woods and thickets; s. N.Y. to Fla., w. irregularly to Ill., Ark., e. Okla., and e. Tex. Sept., Oct. (G. cherokeensis; Dasystephana latifolia)