Gentiana flavida A.Gray
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stout, 3–10 dm, almost always unbranched; herbage glabrous; lvs yellow-green, spreading, lanceolate or lance-ovate, 5–15 × 1.5–5 cm, long-acuminate, widest near the broadly rounded or subcordate sessile base, often 3-nerved; infl usually compact and many-fld; cal-lobes lance-ovate to deltoid-ovate, 4–15 mm, often spreading, with a prominent keel decurrent onto the tube; cor yellowish-white or greenish-white, 3.5–5 cm, narrowly open, its broadly ovate lobes commonly 4–6 mm longer than the oblique, ± erose plaits; anthers connate. Moist prairies and open woods; irregularly from s. Ont. to Pa. and N.C., w. to Minn., e. Neb., e. Kans., and n. Ark., more abundant westward. Sept., Oct. (G. alba Muhl., nomen subnudum)