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..
Perennial aromatic succulent creeping herbs, usually pubescent. Stems terete. Leaves opposite; blades broadest below the middle, palmately nerved, entire or shallowly toothed, punctate, partly clasping. Flowers solitary on short axillary peduncles. Calyx subtended by 2 small bractlets. Sepals nearly distinct, the outer ones cordate, the upper one broadest. Corolla blue or white, manifestly 2-lipped, the upper lip merely notched. Hypogynous disk present. Stamens 4, included; filaments adnate to near the throat of the corolla-tube. Capsule ovoid to conic, septicidally dehiscent, the valves cleft. Seeds numerous. [Name unexplained.]
About 8 species, of the southeastern United States, the West Indies and South America. Type species: Herpestis obovata Poepp. (See Linnaea 5: 107.)
Obolaria caroliniana Walt. Fl. Car. 166. 1788. Monniera amplexicaulis Michx. Fl. Bor. Am. 2: 22. 1803. Herpestis amplexiculis Pursh, Fl. Am. Sept. 418. 1814. M. caroliniana Kuntze, Rev. Gen. Pl. 463. 1891. Septilia caroliniana Small, Fl. SE. U. S. 1064. 1903.
Perennial by stolons, more or less pubescent, fleshy; stems creeping and ascending, rooting at the lower nodes, 6'-2° long, simple, or sparingly branched, leafy. Leaves ovate to oval, sessile and clasping by a subcordate base, obtuse at the apex, parallel-veined, punctate, entire, the margins ciliolate or naked; peduncles shorter than the leaves; usually shorter than the calyx; upper calyx-segment ovate, cordate; flowers blue, 4"-5" long, ephemeral; disk 10-12-toothed; stamens approximate in pairs.
In wet pine barrens, New Jersey to Florida and Louisiana. June-Oct.