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..
Satureja Thymus virginicus L. Mant. 2: 409. 1771. Not S. virginica L. 1753. Origanum flexuosum Walt. Fl. Car. 165. 1788. Koellia capitata Moench, Meth. 408. 1794. Pycnanthemum linifolium Pursh, Fl. Am. Sept. 409. 1814. P. flexuosum B.S.P. Prel. Cat. U. S. 42. 1888. Koellia flexuosa MacM. Met. Minn. 452. 1892.
Stem slender, stiff, nearly glabrous throughout, 1 1/2°-2 1/2° high. Leaves linear or linear-lanceolate, entire, glabrous or the uppermost puberulent, sessile, or the lower very short-petioled, 1'-2' long, 1/2"-1 1/2" wide, rather firm, often with short leafy branches in their axils; glomerules dense, terminal, corymbed, 3"-5" broad, canescent; bracts appressed, acuminate, or subulate-tipped, not longer than the clusters; calyx cylindraceous, canescent, its teeth subulate and rigid, equal or nearly so, 3-4 times longer than broad, about one-third as long as the tube; corolla-tube longer than the calyx.
2: Part 1, 355. 1878. Koellia pilosa Britton, Mem. Torr. Club 5: 279. 1894.
Pubescent, at least above, I°-2 1/2° high. Leaves lanceolate, very short-petioled or sessile, entire or very sparingly denticulate, 1-2' long, 3"-6" wide, firm, acuminate at the apex, mostly narrowed at the base, commonly with smaller ones, or short leafy shoots in their axils; glomerules dense, numerous, terminal, villous or hirsute-canescent, about 4" in diameter; bracts lanceolate, acuminate, equalling or exceeding the clusters; calyx cylindraceous, narrow, canescent, its teeth lanceolate-subulate, equal, often ciliate, about 3 times as long as wide and one-fourth the length of the tube; corolla pubescent, its tube little longer than the calyx; stamens exserted.
Koellia leptodon (A. Gray) Small, of the North Carolina mountains, with bristly-ciliate calyx-teeth, is recorded as extending to Ohio and Missouri.
Brachystemon verticillatum Michx. Fl. Bor. Am. 2:
6. pl. 31. 1803. P. Torreyi Benth. Lab. Gen. & Sp. 329. 1834. Koellia verticillata Kuntze, Rev. Gen. Pl. 520. 1891.
Puberulent, glabrate or pubescent; stem slender, 1°-2 1/2° high. Leaves lanceolate, oblong-lanceolate or linear-lanceolate (rarely ovate-lanceolate), short-petioled or sessile, serrulate or entire, acute or acuminate at the apex, rounded or narrowed at the base, 1'-3' long, 3"-10" wide, the uppermost sometimes canescent; flower-clusters dense, canescent, s"-6" broad, terminal, corymbose and commonly also in some of the upper axils; bracts appressed, lanceolate, acuminate, ciliate, equalling or longer than the clusters; calyx canescent, its teeth subulate or lance-subulate, ciliate, 2-3 times as long as wide, one-fourth to one-third as long as the tube; corolla pubescent, its tube rather exceeding the calyx.
In dry fields and thickets, Vermont to Virginia, west to Missouri. July-Sept.