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..
Clinopodium incanum L. Sp. Pl. 588. 1753. Pycnanthemum incanum Michx. Fl. Bor. Am. 2: 7. 1803. Koellia incana Kuntze, Rev. Gen. Pl. 520. 1891.
Stem pubescent, or glabrous below, stout, 1 1/2°-3° high. Leaves thin, ovate to ovate-lanceolate, peti-oled, acute at the apex, sharply serrate or serrulate, white-canescent beneath, puberulent or glabrous above, 1 1/2'-3' long, 1/2'-1 1/2' wide, or the uppermost smaller and sometimes canescent on both sides; clusters loose, terminal and in the upper axils, 1'-1 1/2' broad, canescent, the flowers sometimes secund on their branches; bracts linear, or the outer broader, canescent or slightly villous, spreading, mostly shorter than the clusters; calyx canescent, slightly 2-lipped, its teeth subulate, somewhat unequal, the longer one-fourth to one-half as long as the tube, rarely villous; corolla-tube equalling or longer than the calyx.
Tullia pycnanthemoides Leavenw. Am. Journ. Sci. 20:
343. Pl. 5. 1830. P. Tullia Benth. Lab. Gen. & Sp. 328. 1834. K. pycnanthemoides Kuntze, Rev. Gen. Pl. 520. 1891. P. pycnanthemoides Fernald, Rhodora 10: 86. 1908.
Stem rather stout, pubescent nearly to the base, 2°-3° high. Leaves membranous, petioled, mostly ovate-lanceolate, acuminate or acute at the apex, narrowed at the base, sharply serrate, pubescent beneath, puberulent or glabrate and dark green above, 1 1/2'-3 1/2' long, 1/2'-1 1/2' wide, the lower green, the upper smaller and white-canescent on both sides; clusters loose, villous and canescent, terminal and axillary, 1'-2' broad, the flowers often secund; bracts linear-oblong, acuminate or subulate-tipped, villous, spreading; calyx-teeth very unequal, subulate, villous, the longer about equalling the tube; corolla-tube not exceeding the calyx.
In dry woods and on hills, Virginia to Georgia, Kentucky and Tennessee. Calamint. July-Sept.
P. albescens T. & G.; A. Gray, Am. Journ. Sci. 42:
45. 1842. Koellia albescens Kuntze, Rev. Gen. Pl. 520. 1891.
Stem slender, soft-pubescent nearly to the base. 1°-2° high. Leaves ovate to ovate-lanceolate, peti-oled, acute or subacuminate at the apex, narrowed or sometimes rounded at the base, sharply serrate or nearly entire, l'-2 1/2' long, 1/2'-1 1/4' wide, white-canescent beneath, green above, or the upper canes-cent on both sides; clusters loose, terminal and axillary, densely canescent, not at all villous, at length about 1' broad; bracts linear, or the outer broader, spreading, sometimes exceeding the clusters; calyx densely canescent, its teeth triangular, obtuse or acute, slightly unequal, one-fifth to one-fourth as long as the tube; corolla-tube longer than the calyx.
In dry woods and thickets, southern Virginia to Kentucky, Missouri, Arkansas, Florida and Texas. July-Sept.