An erect, up to 1.5 m tall shrub with terete, glutinous hairy stems. Leaves on 6-15 mm long petioles; lamina elliptic-ovate, 5-8 x 1.5-3 cm, densely hairy on both sides, basally cuneate to rounded, crenate-serrate, acute to shortly acuminate. Flowers pale blue, 2.5-3 cm across, in short, often capitate spikes or lowest flowers solitary in leaf axils; bracts ovate, 7-8 mm long, persistent, densely glutinose-villose; bracteoles oblong, smaller than bracts, densely villose. Calyx 5-lobed to the base, glandular-pubescent, lobes unequal, linear, 8-13 mm long, obtuse Corolla 3.5-5 cm long, glabrous, tube cylindric for half its length and nearly as long as curved part, limb lobes patent. Ovary glandular with linear style and reflexed stigma. Capsule 1.5-1.8 cm long, glandular-pubescent, 4-seeded. Seeds ovate, 3-4 mm long, hairy.