This is largely midwestern species of damp soils, but it ranges widely across northern states and adjacent Canada, extending south to near the Ky. line in W.Va., Ohio, Ind., Ill. and Mo. (K). G. andrewsii may intergrade with saponaria and puberulenta to a limited extent (Cr, Pringle 1967); see dets. of J.S. Pringle at Field Museum and elsewhere. It has been recently collected from CAMP in wet woods along the Ohio Rv. (KNK, Naczi et al. 2002). Older records (M) are based on misidentified saponaria (ADAI & TAYL at Field) or remain doubtful. There are colls. of andrewsii by C.W. Short (GH, PH) that may be from Ky. but with uncertain provenance; the coll. at GH is mounted on the same sheet as a coll. of saponaria, which is labelled "banks of the Ohio River, Ky., Oct 1842". However, it is unclear if the andrewsii came from the same location. See also notes under puberulenta. Another northern gentian of damp sites, Gentianopsis crinita (Frölich) Ma, was reported from Ky. by Gray (1864), but no coll. has been located and the record did not become accepted (F, K, M).