Annual herb, up to c. 10-15 cm. Stems flattened (also in vivot), minutely appressed-pubescent, internodes up to about twice as long as the leaves. Leaves lanceolate (rarely ovate-lanceolate) 5-6 by 1.5 mm, herbaceous with a narrow, white, membranous margin, glabrous, contracted at base, aristulate at apex, 1-nerved. Flowers solitary in the upper leaf-axils. Pedicel 0.5-1 cm, minutely pubescent. Calyx conical-campanulate, 3½ mm long, glabrous, about halfway connate, lobes acute-triangular, with a narrow white membranous margin and aristulate like the leaves. Corolla white, campanulate, 4.5 mm, inside with long bristles in the mouth and some short hairs at the apex of the lobes; lobes elliptic, acute, 2 mm long. Stamens short, filaments 1.2 mm, strap-shaped; anthers basifixed, introrse, sagittate, 1 mm long, acute and with some short bristles at the apex. Pistil 2 mm, ovary globular, 0.75 mm, styles inserted far apart, connate in their upper half, stigma truncate. Fruits globular, 1.25 mm ø, completely enveloped by the calyx-tube, styles soon separating from each other. Seeds angular, 0.2 mm, minutely warty.
In grasslands, open places with very low vegetation, c. 8 m alt., locally common. Fl. fr.--09.
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