Annuals to 30 cm tall. Roots fibrous, fascicled. Stems suberect or prostrate basally and rooting from lower nodes then ascending, many branched, channeled, glabrous. Petiole short and wide; leaf blade oblong, oblong-lanceolate, oblong-oblanceolate, or linear-lanceolate, 0.8-4 X 0.6-2 cm, glabrous, base cuneate and decurrent, margin obscurely to sharply serrate or subentire, apex acute to rounded. Racemes terminal, to 15 cm, 2-20-flowered; bracts subulate. Pedicel to 1.5 cm, ascending, spreading, to deflexed in fruit. Calyx lobed to base; lobes lanceolate, hispidulous along midrib and edges. Corolla purple, purplish white, or white, to 1 cm; tube to 7 mm; lower lip 3-lobed, lobes subequal; upper lip 2-lobed. Fertile stamens 2, posterior; filaments unapendaged. Reduced stamens 2, anterior; filaments slightly curved, glandular. Stigma lamellate. Capsule cylindric, 2 X or more as long as persistent calyx. Seeds brown, irregularly triangular-ovoid; seed coat reticulate. Fl. and fr. spring-autumn.