A semi-climbing shrub, often diffusely branched, glabrous except the inflorescence. Leaves elliptic to elliptic-spathulate or elliptic-ovate, 3-7 cm long, obtuse and shortly mucronate, tapering into a short petiole. Flowers in compact panicle. Bracts ovate-mucronate. Calyx tubular, 2-3 times shorter than the corolla, finely pubescent with stalked glands on the upper part, limb 5-fid. Corolla gamopetalous, tube 2 cm long; limb usually blue, 5-lobed.