Herbs annual, glabrous. Stem solitary, erect, 10--40 cm tall, branched from base; branchlets alternate, strict. Basal leaves in a rosette, linear-oblanceolate, 2.5--3.5 cm × 3--15 mm, midvein conspicuous, margin rough, apex acute; cauline leaves erect, broadly linear, smaller than basal leaves. Cymose panicle lax. Pedicel 1--1.5 cm. Calyx green, 3--4(--5.5) × ca. 1.5 mm, 5-veined, ribbed, teeth shortly triangular, apex acute. Petals white, oblong-obovate, 3--6 mm, slightly longer than calyx, not clawed, margin entire. Stamens included. Styles included. Capsule cylindric-obovoid, ca. 5 mm. Seeds ovoid, 0.7--1.2 mm, tuberculate. Fl. May--Jun, fr. Jul--Aug. 2n = 30.
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