Cerastium semidecandrum L., it is an annual, procumbent to erect, up to 30 cm tall, pale green, glandular-pubescent herb. Leaves oblanceolate to ovate-oblong, up to 18 x 8 mm, attenuate. Basal leaves shortly petioled. Cauline leaves sessile and sub vaginate, pilose. Flowers in terminal, lax, ± umbelloid dichasial clusters; Bracts, green in the lower half, scarious and glabrous in upper half, rarely entirely scarious. Pedicel equalling or slightly longer than sepals, sharply bent downwards in fruit. Sepals lanceolate, 3-5 mm long, glandular-pubescent outside, with broad scarious margins, acute. Petals 5, lanceolate, slightly shorter to as long as sepals, glabrous, with unbranched veins, slightly emarginate to denticulate. Stamens 5, rarely more, filaments 2-3 mm long, anthers ovoid, yellow. Ovary oblong, glabrous, styles 5, stigmatic internally up to the base. Capsule pale coloured, 5-7 mm long, glabrous dehiscing by 10 marginally revolute teeth. Seed somewhat rounded reniform, pale brown, c. 0.4-0.5 mm long, finely tuberculate.
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