The dark-blue two-lipped flowers are medium-sized false whorls in one-sided, terminal leafy racemes. The calyx is downy, with 5 tips and glabrous inside. There are 4 stamens, which are turned away from each other and extend far above the perianth. The style is very long. The plant is an evergreen subshrub which grows to about 2 feet high. The stem is erect, quadrangular, shrubby, and branched. The leaves are sessile, lanceolate, acute, entirely margined, glabrous, dark green, and paler beneath. The plant has a weak sweetish smell and the taste is bitter.