Annual, unbranched, or branched from the base. Stems erect, quadrangular, 5-30 cm, with a dense indumentum of short eglandular retrorse hairs, leafy. Leaves simple, 15-20 x 7-15 mm, oblong-obovate, crenate, cuneate, below with short eglandular hairs and scattered sessile oil globules; petiole up to 15 (-20) mm. Inflorescence starting from near base of stem; verticillasters in axils of leaves, numerous, 6-8 flowered, distant or contiguous; bracts several, linear-oblong as long as or longer than calyx, sessile or shortly petiolate, cuneate, with marginal awns 2-4 mm long. Calyx tubular, 6-7 mm, prominently veined or ribbed, with short eglandular spreading hairs and a few sessile oil globules; upper lip with 3 ovate obtuse lobes; lower lip with 2 narrower lobes; all shortly acuminate; teeth clearly convergent in fruit and closing the mouth. Corolla pale lilac, blue to whitish pink, c. 7-8 mm, slightly longer than calyx; upper lip c. 1.5 mm long, dearly shorter than lower lip. Nutlets 2.5 x 1 mm, dark brown, markedly triquetrous, with a small attachment scar, clearly mucilaginous on wetting.