Slender, erect, 2-5 dm, rarely branched; lvs linear or narrowly oblanceolate, 2-7 cm נ1-5(-8) mm, narrowed to the base; fls solitary and terminal on the stem (and branches, if any), the peduncle to 3 cm; cal-lobes linear, 10-25 mm, not ciliate; cor blue, spotted with bronze-green inside the tube, the loosely spreading lobes ovate or elliptic, obtuse, their free portion (beyond the fimbriate plaits) 10-15 mm; anthers separate; 2n=26. Moist pine-barrens on the coastal plain, locally from N.J. to S.C. Sept., Oct. (G. porphyrio)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.