Slender herb, creeping, decumbent, sometimes erect, to 75 cm. Stem sparsely hirsute. Leaves membranaceous, lanceolate-ovate or ovate, 1.5-4 (-6) by 0.8-2.5(-4) cm, acute; base cuneate, narrowed into the petiole, entire; margin elsewhere serrate, hirsute and puberulent on both surfaces; petiole 2-10 mm. Flowers 2-3 in a verticillaster, in terminal spikes, 6-15 cm long, very slender. Bracts lanceolate-ovate, 1.5 mm long. Calyx campanulate, 1.5-2 mm long, in fruit 3-4 mm, covered with both long strigose and short capitate glandular hairs, deeply 2-lipped; upper lip rounded shortly caudate, lower lip 2-toothed. Corolla pale violet to dark blue, 5-6 mm long; lower lip nearly twice as long as the upper one. Nutlets ellipsoid, 1.2-1.5 mm long.
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