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..
A low pubescent spreading or decumbent herb, with long-petioled cordate leaves, trailing leafy stolons, and large blue flowers in terminal secund bracted spikes. Calyx campanulate, 15-nerved, slightly 2-lipped, its teeth all lanceolate, acute, the 3 upper longer than the 2 lower. Corolla much exserted, puberulent without, pubescent within, the tube narrow at the base, gradually widely ampliate into the throat, the limb 2-lipped; upper lip 2-lobed, arched, the lobes ovate, obtuse; lower lip about equalling the upper, spreading, 3-lobed, the middle lobe emarginate, broader than the lateral ones. Stamens 4, didynamous, all anther-bearing, included, ascending under the upper lip, the upper pair longer than the lower; anthers 2-celled, the sacs nearly parallel. Ovary deeply 4-lobed; style equally 2-cleft at the summit. Nutlets oblong, smooth. [Named for Thomas Meehan, of Philadelphia, 1826-1901, botanist and horticulturist.]
A monotypic genus of eastern North America.
Flowering stems ascending, 3'-8' high; stolons very slender, leafy throughout, sometimes 2° long. Leaves all broadly ovate or ovate-orbicular, thin, obtuse or subacute at the apex, crenate all around, cordate at the base, sparingly pubescent with scattered hairs on both surfaces, or nearly glabrous beneath, green on both sides, 1-2' long, the basal sinus broad; spikes 1-4' long; bracts ovate or oblong, acute, membranous, the lower sometimes crenulate and surpassing the calyx; bractlets small, lanceolate; calyx about 5" long, puberulent, its longer teeth about one-half the length of the tube; corolla 1'-1 1/4' long, showy.