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..
Annual, pubescent; stems branched from the base, very slender, 6'-8' high. Leaves oblong or ovate-oblong, petioled, acutish at both ends or the lower obtuse, crenulate or entire, 4"-8" long; flowers about 6 in the axils, the clusters sessile; bracts shorter than the pedicels; calyx gibbous on the lower side, rough-hairy, longer than its pedicel, contracted at the throat, its subulate teeth somewhat unequal in length; corolla purplish, 1 1/2-2 times as long as the calyx.
In waste places, Ontario to Massachusetts and New Jersey. Adventive or naturalized from Europe. Mother-of-thyme. Polly mountain. May-Aug.
Hedeoma glabra Nutt. Gen. 1: 16. 1818.
Cal. Nuttallii Benth. in DC. Prodr. 12: 230. 1848.
Calamintha glabella var. Nuttallii A. Gray, Man.
Ed. 2, 307. 1856. Clin, glabrum Kuntze, Rev. Gen. Pl. 515. 1891.
Perennial, glabrous, stoloniferous; stem very slender, at length much branched, erect or ascending, 4'-12' high. Leaves of the flowering branches linear, entire, very short-petioled or sessile, mostly obtuse at the apex, obscurely veined, 4"-9" long, 1/2"-1" wide, the margins slightly revolute; lower leaves and those of the stolons shorter and broader, distinctly petioled; flowers 1-4 in the axils; bracts minute; pedicels filiform, mostly longer than the calyx; calyx not gibbous, its throat pubescent in a ring within, its lower teeth somewhat longer than the upper; corolla purple, about 4" long.
On rocks and banks, Ontario to western New York, Illinois, Minnesota, Missouri, Arkansas and Texas. May-Aug.
Cunila glabella Michx. Fl. Bor. Am. 1: 13. 1803. Calamintha glabella Benth. in DC. Prodr. 12: 230.
1848. Clin, glabellum Kuntze. Rev. Gen. Pl. 515. 1891.
Perennial, stoloniferous, glabrous; stems weak, spreading or decumbent, at length freely branched, elongated, slender, 8'-2° long. Leaves membranous, oblong, short-petioled, obtuse or the uppermost subacute at the apex, narrowed to a cuneate base, distinctly serrate with low teeth, 1'-2' long, 2"-8" wide, the lowest and those of the stolons sometimes proportionately broader and shorter; axils 2-5-flowered; pedicels filiform, commonly twice as long as the calyx; bracts minute; calyx not gibbous, its throat pubescent in a ring within, its teeth nearly equal; corolla purplish, 6"-7" long.
• On river banks, Indiana to Kentucky, Tennessee and Arkansas. May-July.