an annual herb, glabrous or very nearly so; stem weak, decumbent, usually branched at the base, striate and furrowed, obtusely tetragonous, 6–12 in. long; leaves opposite, broadly ovate or suborbicular, obtuse at the apex, usually cordate at the base, crenate-serrate, rather thinly membranous, 1/4–1 1/3 in. long, 1/6–1 in. broad, the upper subsessile, the lower petioles ranging to an inch long, the lowest to 4 in.; racemes terminal, many-flowered, simple, rather lax or elongated; pedicels slender, the lower 1/4– 2/5 in. long, the upper shorter; bracts ovate, acute, cordate, sessile, smaller than the leaves, usually deflexed; calyx-segments ovate, oval or lanceolate, obtuse or acute, 1/12– 1/10 in. long; corolla puce-coloured or purple, about 1/4– 1/3 in. broad, with two very short pouches; filaments linear, flattened, glabrous; capsule ovoid-oblong, obtuse, 1/4 in. long, 1/8 in. broad; seeds marked with parallel furrows. null
