Plants 0.2-1.6 dm. Stems erect to ascending. Leaves 3-18 mm; proximal cauline whorled, blade linear-spatulate; distal usually opposite, blade broadly linear; petiole to 10 mm; margins entire. Inflorescences: peduncle 2-8 cm. Flowers: receptacle shorter than broad, expanded into small ring beneath calyx; petals white, alternately obovate and oblanceolate, 1-5 × 1-3 mm, apex rounded; stamens 4-6, in 1 series; filaments ± equal, usually as broad as anthers; anthers ovoid, minute, much shorter than filaments. Capsules to 25 × 1.5 mm. 2 n = 16.
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