Erect, annual (or perennial?) herb, up to 12 cm, branched at the base. Stems terete, canaliculate, scabrous, internodes about as long as the leaves. Leaves sessile, ovate, 2.5 by 1.5 mm, stiff, glabrous, broadly cuneate at base, apex acute to aristulate, margin revolute, distinctly thickened as is the midrib on the lower surface. Flowers solitary in the upper leaf-axils. Pedicels 1.5-2.5 mm, slender, scabrous. Calyx campanulate, 1.5 mm long, glabrous, connate for 2/3, lobes triangular, acute, midrib strongly thickened as are the margins near the apex. Corolla 2 mm long, bearded in the mouth, white, lobes 2/3 mm long, nearly acute. Anthers subsessile, introrse, 1/4-1/3 mm long. Pistil small, styles ⅓ mm long, far apart at the base, connate in the upper half. Capsules broadly mitre-shaped, c. 1 1/3 mm high, styles torn loose. Seeds ellipsoid, brown, minutely warty.
In open vegetation, on cliffs and dry limestone hills, locally gregarious; from sea-level up to 400 m. Fl. fr. May-July.
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