This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Gentiana procera Holm, Ottawa Nat. 15: 11. 1901.
Annual; similar to the preceding species but smaller; stem simple, or little branched, 3'-18' high. Basal and lower leaves spatulate, obtuse, the upper linear or linear-lanceolate, l'-2 1/2' long, 2"-4" wide; flowers 1-6, solitary at the ends of elongated erect peduncles, mostly 4-parted, about 1 1/2' high; calyx-lobes lanceolate, acuminate, their midribs decurrent on the tube; corolla narrowly campanulate, bright blue, its lobes spatulate-oblong, strongly fringed on both sides, entire or somewhat fimbriate or toothed around the apex; capsule short-stipitate; seeds scaly-hispid.
In wet places, New York and Ontario to Minnesota, South Dakota and Manitoba. July-Sept. Previously confused with G. detonsa Rottb. and with G. serrata Gunner, Old World species. Northwestern and Rocky Mountain plants formerly referred to this species prove to be distinct from it.
Gentiana nesophila Holm, of Anticosti, differs in merely denticulate corolla-lobes.
Gentiana acuta Michx. Fl. Bor. Am. 1: 177. 1803. Gentiana Amarella var. acuta Herder, Act. Hort. Petrop. 1: 428. 1872.
Annual; stem leafy, slightly wing-angled, simple or branched, 6'-2o' high. Basal and lower leaves spatulate or obovate, obtuse, the upper lanceolate, acuminate or acute at the apex, rounded or subcordate at the base, sessile, or somewhat clasping, ¥-2' long; flowers numerous, racemose-spicate, 5"-8" high, the pedicels 2"-6" long, leafy-bracted at the base; calyx deeply 5-parted (rarely 4-parted), its lobes lanceolate; corolla tubular-campanulate, 5- lobed (rarely 4-lobed), blue, its lobes lanceolate, acute, each with a fimbriate crown at the base; capsule sessile.
In moist or wet places, Labrador to Alaska, Maine, Minnesota, south in the Rocky Mountains to Arizona and Mexico. Also in Europe and Asia. Closely resembles the Old World G. Amarella. Felwort. Bastard-gentian. Bald-money. Summer.
Gentiana propinqua Richards. Frank. Journ. 734. 1823.
Stems slender, usually branched from the base and sometimes also above, slightly wing-angled, 2-7' high. Basal leaves spatulate., obtuse, the upper distant, obiong or lanceolate, 1/2'-1 1/2' long, acute or obtusish at the apex, rounded at the slightly clasping base, obscurely 3-nerved; flowers few or several, solitary on slender peduncles, mostly 4-parted, 8"-10" high; calyx 4-cleft, 2 of the lobes oblong, the others linear-lanceolate; corolla blue or bluish, glandular within at the base, its lobes ovate-lanceolate, entire or denticulate; capsule linear, at length a little longer than the corolla.
Labrador to Alaska and British Columbia. Summer.
Gentiana quinquefolia L. Sp. Pl. 230. 1753. Gentiana quinqueflora Lam. Encycl. 2: 643. 1786.
' Annual; stem ridged, usually branched, 2'-2 1/2° high, quadrangular. Basal leaves spatulate, obtuse, those of the stem ovate, acute at the apex, clasping and subcordate or rounded at the base, 3-7-nerved, 1/2'-2' long; flowers in clusters of 1-7 at the ends of the branches, or also axillary; pedicels slender, 2"-7" long; calyx one-fourth to one-third the length of the corolla, its lobes narrow, or sometimes folia-ceous, acute; corolla tubular-funnelform, 5"-10" long, blue or yellowish, glandular within at the base, its lobes triangular, very acute, entire; capsule stipi-tate; seeds globose, wingless.
In dry or moist soil, Maine and Ontario to Michigan, south to Florida and Missouri. Ascends to 6300 ft. in North Carolina. Consists of several or many races, differing in size of plant, size of corolla; the calyx-lobes narrow or broad. Five-flowered gentian. Gall-of-the-Earth. Gall-weed. Aug.-Oct.