Hispid annual. Stem 10-20 cm, dichotomously branched from base, weakly angular and striate. Leaves usually alternate, 10-20 x 5-10 mm, ovate or obovate, crenate-dentate, sometimes lobulate, sessile, setose. Flowers inconspicuous, 1-3 in terminal clusters and axillary in angles of furcate stem. Calyx lobes triangular-lanceolate, acute, erect, longer than obconical tube, slightly shorter than corolla, becoming spreading-stellate and accrescent after anthesis. Corolla cylindrical, 2-5 mm, divided to 1/3, with erect lobes, glabrous, pale blue to whitish. Style included. Stigmas 3, short. Capsule broadly turbinate, nodding, irregularly dehiscing and opening by 3 basal valves. Seeds small, elongate, ovoid, 0.6-0.7x0.2 mm, light brown, shiny. Fl. 4-8. Limestone rocks and walls, nr s.l.1400 m.
Mediterranean area, eastwards to Crimea, N. Iraq, Iran & Transcaucasia Medit. element.