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..
Phlox divaricata L. Sp. Pl l52. 1753.
Finely viscid-pubescent; stems ascending or diffuse, slender, producing creeping or ascending leafy shoots from the base. Leaves of the sterile shoots oblong or ovate, obtuse, 1'-2' long, those of the flowering stems lanceolate, ovate-lanceolate, or oblong, mostly acute or acutish; flowers pedicelled in open corymbed cymules, faintly fragrant; calyx-teeth subulate, longer than the tube; corolla bluish, its lobes obcordate, emarginate or entire, not much longer than the tube, sometimes shorter; capsule oblong-globose, about 2" high.
Phlox stolonifera Sims, Bot. Mag. pl. 563. 1802. Phlox reptans Michx. Fl. Bor. Am. 1: 145. 1803.
Hirsute or pubescent; stems slender, diffuse, producing sterile creeping leafy shoots from the base. Leaves of the sterile shoots obovate, obtuse at the apex, 1'-3' long, narrowed at the base into petioles; flowering stems 4'-10' high, their leaves oblong or lanceolate, acute or obtuse, smaller; flowers in a simple or barely compound cyme, slender-pedicelled; calyx-teeth linear-subulate, as long as the tube or longer; corolla pink, purple or violet, its lobes rounded, mostly entire, about one-half the length of the tube; capsule subglo-bose, 1 1/2" high.
In woods, Pennsylvania to Georgia and Kentucky, mainly in the mountains. Ascends to 4500 ft. in Virginia. April-June.
P. bifida Beck, Am. Journ. Sci. 11: 170. 1826.
Puberulent or pubescent; stems diffuse, somewhat woody, much branched, slender, often 1° long, the branches erect or ascending, 4'-8' high. Leaves of sterile shoots linear, sessile, 1'-2' long, 1"-2" wide, acute, those of flowering branches linear-obiong or lanceolate, much shorter; flowers in simple cymes or solitary in the axils, slender-pedicelled; pedicels 3"- 12" long; calyx-teeth lanceolate-subulate, somewhat longer than the tube; corolla pale purple, its lobes as long as the tube or somewhat shorter, cuneate, cleft to about the middle into linear or oblong obtuse diverging segments; capsule oblong-globose, \"-\\" high.
In dry places, Indiana to Tennessee, Michigan and Missouri. April-June.
Glabrous or puberulent; stems diffuse, somewhat woody, much branched, the branches nearly erect, 3'-8' high. Leaves all linear, or linear-lanceolate, sessile, acute, 1'-2' long, 1"-1 1/2" wide; flowers in simple cymes or solitary in the axils, slender-pedicelled; calyx-teeth subulate-lanceolate, shorter than the tube; corolla pale blue or nearly white, its lobes cuneate, 2-lobed at the apex, nearly as long as the tube.
On cliffs, southern Illinois and Kentucky and in Tennessee. April-May.