A gregarious, basally woody, up to 60 cm, undershrub with 4-angled, pubescent or glabrous twigs. Petiole up to 5 cm long, winged or the upper most leaves sessile; lamina membranous, elliptic-oblong to lanceolate, 3-12 x 0.8-5 cm. almost glabrous on both sides, basally attenuate or upper ones cordate, crenate-serrate, long acuminate; Flowers pale-blue, 2.5-3.5 cm long, paired or solitary in lax, monochasial spikes; bracts persistent, leafy, ovate, 8-10 mm long, glabrescent; bracteoles linear-oblong or absent. Calyx lobes linear-lanceolate, 7-8 mm long, glabrous except the glandular hairy apices, enlarged to c. 2.5 cm in fruit, subacute. Corolla tube cylindrical, nearly straight or slightly curved, limb c. 1.5-1.8 cm across, lobes short, obtuse. Capsule oblong, 1.2-1.6 cm long, glabrous, 4-seeded; Seeds ovate, c. 3 nun long, hairy.