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..
Many-stemmed from a woody root, the stems spreading, creeping, or ascending, sometimes 8' long, glabrous, or slightly pubescent above, very leafy. Leaves oblong, or linear-oblong, sessile, glabrous, or nearly so 3"-12" long, 1"-2" wide, or the upper longer and narrower, thick, rigid, the apex spinose-mucronate, the revolute margins ciliate; flowers sessile or short-peduncled; peduncles and calyx somewhat glandular-pubescent or glabrous; calyx-teeth subulate, as long as the tube or longer; corolla-tube somewhat exceeding the calyx, the limb about 8" broad, blue or lilac, the obovate-cuneate lobes rounded or truncate.
North Dakota to Nebraska, Montana and Wyoming. May-June.
Phlox subulata L. Sp. Pl. 152. 1753.
Pubescent or becoming glabrate. Stems tufted, forming mats, diffuse, much branched, the branches 2'-6' long. Leaves persistent, subulate-linear, linear-lanceolate or linear-oblong, acute or acuminate, 4"-10" long, 1/2"-1" wide, spreading, ciliate, rigid, commonly fascicled at the nodes; flowers in simple cymes, slender-pedicelled; calyx-teeth subulate from a broader base, about as long as the tube; corolla pink, purple or white, with a darker eye, its lobes emarginate or entire, shorter than the tube; capsule oblong, nearly 2" high.
In dry sandy or rocky soil, New York to Florida, west to Michigan and Kentucky. Ascends to 3500 ft. in West Virginia. Wild or mountain-pink. Flowering moss. April-June.
Phlox Brittonii Small, Bull. Torr. Club 27: 279. 1900.
Glandular-pilose, deep green; stems copiously branched, forming wide mats. Leaves numerous, with small ones often clustered in the axils of the larger, subulate or narrowly linear-subulate, 2 1/2"-5" long, ciliate, especially near the base; calyx glandular-pubescent like the branches, the lobes subulate, about as long as the tube; corolla mainly white, the limb 12-13 mm- broad, its lobes cuneate, much shorter than the tube, with 2 pale magenta spots at the base, cleft by a V-shaped sinus, a minute tooth in each sinus; capsule oblong, 2" high.
On dry mountain slopes, Virginia, West Virginia and North Carolina. May.
Depressed, shrubby, moss-like, densely branched from a deep woody root, forming compact tufts 2'-3' high. Leaves minute (about 1" long), closely imbricated in 4 ranks, copiously white-woolly, triangular-lanceolate, pale, acute, the margins infolded; flowers solitary and sessile at the ends of the branches, about 2 1/2" long; tube of the corolla longer than the calyx, its lobes broadly cuneate, entire.
On dry hills, western Nebraska, Colorado and Wyoming. May-July.