A glabrous, erect or decumbent perennial 9-40 cm tall, branched. Stem and branches subangular, shoot tip minutely glandulose. Leaves 20-53 x 6-15 mm, alternate, ovate-cuneate, acute-subacuminate, upper ones smaller, decurrent, glandular-punctate, margin crisp, crenulate-wavy or entire, minutely puberulous, under surface lighter coloured. Petiole shorter or almost equalling the lamina. Flowers axillary solitary (-2), subsessile. Pedicel less than 1 mm, up to 3 mm in fruit. Calyx lobes subacuminate (apiculate), red glandular-streaked, margin membranous, towards apex minutely asperulous. Corolla campanulate, slightly exceeding the calyx; lobes ligulate, obtuse or subacute. Stamens opposite the lobes; filaments c. 0.8 mm, not exserted; anther ovate-cordate, less than the filament in length, yellow, glabrous, versatile; tube obscure, adnate to the corolla tube, glandular-stipitate. Ovary globose-ovoid, c. 1.5 mm broad. Style c. 1.8 x 0.5 mm, persistent, included; stigma subcapitate. Capsule globose, 3.5-4 mm broad, glabrous, dehiscing irregularly. Seeds 34-38 in number, trigonal, reticulate.