Flora of North America species comparison

Varieties 2+ (1 in the flora).

Gentiana prostrata is variously divided into subspecies and/or varieties. At least two, perhaps more, varieties seem appropriately recognized at that rank (one in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Because of the relatively late recognition of Gentiana austromontana as a distinct species, specimens of this species have been identified both as G. clausa and as G. decora. Gentiana austromontana is distinguished from G. andrewsii, G. clausa, and G. latidens by the combination of puberulent stems and calyx tubes with free portions of the corolla plicae that are about as long as the lobes and about twice as wide, divided into two more or less triangular segments each similar to a true lobe in size and shape. Because of its puberulence, it has been confused with G. decora, which differs in its more open, generally paler corollas with longer lobes and plicae, and usually narrowly linear calyx lobes.

Both Gentiana austromontana and G. decora occur in the higher elevations of eastern Tennessee and western North Carolina, although G. decora tends to occur in shadier habitats. These species are usually distinctly dissimilar, in each case bearing a greater resemblance to other species than to each other, but populations of plants variously intermediate between the two occur relatively frequently, especially in Greene and Unicoi counties, Tennessee. Plants otherwise typical of G. austromontana but with narrowly open corollas have been found in Mount Jefferson State Natural Area, Ashe County, North Carolina, and may be derived from introgression of genetic material from G. decora. Gentiana austromontana also hybridizes occasionally with G. clausa.

(Discussion copyrighted by Flora of North America; reprinted with permission.)