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..
Pycnanthemum clinopodioides T. & G.; A. Gray, Am.
Journ. Sci. 42: 45. 1842. Koellia clinopodioides Kuntze, Rev. Gen. Pl. 520. 1891.
Pubescent or puberulent; stem slender, 1°-2 1/2° high. Leaves lanceolate or oblong-lanceolate, rather thin, short-petioled, sharply serrate, or the upper entire, 1 1/2'-3' long, 5"-12" wide, none of them canescent; flower-clusters loose, terminal and axillary, about 1' broad; bracts linear-acuminate or subulate-tipped, not exceeding the clusters, some or all of them spreading; calyx finely canescent or glabrate, its teeth subulate, sometimes with a few long hairs, slightly unequal, about one-third the length of the tube; corolla-tube longer than the calyx.
In dry soil, Connecticut to Pennsylvania, Virginia and Tennessee. Ascends to 5000 ft. in Virginia. Aug.-Sept.
P. hyssopifolium Benth. Lab. Gen. & Sp. 329. 1834. Pycnanthemum aristatum var. hyssopifolium A. Gray, Syn. Fl. 2: Part I, 354. 1878. K. hyssopifolia Britton, Mem. 1 orr. Club 5: 279. 1894.
Puberulent or glabrate; stem slender, stiff, 1°-3° high. Leaves oblong, linear-oblong, or lanceolate-oblong, short-petioled, or the upper sessile, obtuse or subacute at the apex, narrowed at the base, entire or denticulate, 1/2'-1 1/2' long, 2"-6" wide, glabrous or minutely canescent; flower-clusters dense, minutely canescent, not at all villous, terminal, and usually also in the upper axils, often 1' broad; bracts linear-oblong, narrowed at each end, terminated by an awn almost as long as the body; calyx cylindraceous, glabrous or very nearly so, prominently nerved, its teeth bristle-pointed, slightly widened below, nearly as long as the tube; corolla-tube not longer than calyx.
In dry soil, Virginia to Florida. June-Aug.
Pyc. aristatum Michx. FI. Bor. Am. 2: 8. pl. 33. 1803. Koellia aristata Kuntze, Rev. Gen. Pl. 520. 1891.
Similar to the preceding species; stem slender, stiff, minutely canescent, 1 1/2°-2 1/2° high. Leaves ovate, or some of them ovate-lanceolate, short-petioled, sharply serrate, serrulate, or the upper entire, acute at the apex, rounded at the base, 1'-2' long, 4,"-12" wide, the uppermost usually minutely canescent; inflorescence as in the preceding species; bracts long-awned, appressed, the awn about one-third the length of the body; calyx canescent, its teeth equal, bristle-pointed, widened below, one-third to one-half as long as the tube; corolla-tube about equalling the calyx.
In dry pine barrens, New Jersey to Florida and Louisiana, mostly near the coast. Wild basil. July-Sept.