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..
[Monniera P. Br. Civ. & Nat. Hist. Jam. 269. pl. 28. f. 3. Hyponym. 1755. Not L. 1759.]
[Herpestis Gaertn. Fruct. & Sem. 3: 186. pl. 214. 1805.]
Diffuse or prostrate herbs, with opposite mostly entire obtuse leaves, and small peduncled flowers, mostly solitary in the axils. Calyx subtended by 2 bracts, 5-parted, the upper segment the broadest. Corolla blue or white, nearly regular, the tube cylindric, the limb nearly equally 5-lobed. Stamens 4, didynamous, included. Style slender; stigma capitate, or 2-lobed. Capsule globose or ovoid, septicidally dehiscent. Seeds numerous. [From Brami, a Malabar name.]
About 20 species, natives of warm and tropical regions. Type species: Bramia indica Lam. Leaves spatulate or cuneate; capsules acuminate at the apex.
1. B. Monniera.
Leaves obovate or orbicular-obovate; capsules blunt at the apex.
2. B. rotundifolia.
Pfl. 43 b: 77. 1891. Bramia Monniera Drake, Fl. Polyn. Franc. 142. 1892.
Perennial, glabrous, fleshy; stem creeping, rooting at the nodes, branched, 6'-18' long. Leaves spatulate or cuneate-obcordate, sessile, rounded at the apex, entire, or sparingly denticulate, 3"-10" long, 1"-2 1/2" wide; peduncles mainly in alternate axils, slender, 2-bracteolate at the summit, in fruit longer than the leaves; flowers pale blue, 5" long; upper calyx-segment ovate, acute; corolla obscurely 2-lipped; stamens nearly equal; stigma slightly 2-lobed; capsule ovoid, acute, shorter than the calyx.
1814. Bacopa rotundifolia Wettst. in Engler & Prantl, Nut. Pfl. 43 b: 76. 1891.
Perennial by stolons, succulent; stems creeping and spreading, branched or simple, villous-pubescent, 1°-2° long. Leaves obovate or orbicular, palmately veined, entire, or slightly undulate, narrowed to a sessile or clasping base, 1/2'-l' broad, glabrous, not punctate; peduncles stout, shorter than the leaves, solitary or 2 together in the axils, longer than the flowers; flowers blue, 3"-4" long; upper calyx-segment oval; corolla 2-lipped, longer than the calyx; stamens approximate in pairs; stigma 2-lobed; disk obsolete; capsule oblong, obtuse, 1 1/2" high, at length 4-valved, shorter than the calyx.
On muddy shores, Illinois to South Dakota, Tennessee and Texas. June-Sept.