Herbs, annual, 5–60 cm, glabrous. Stems ± spreading or ascending, or branches from base prostrate. Leaves: blade linear to linear-oblanceolate, 8–20 × 0.7–2.3 mm. Inflorescences: open panicles or racemes. Pedicels 8–25 mm. Flowers homostylous; sepals ovate, 3–5 mm, margins glabrous, apex acute; petals usually blue, rarely white, obovate, 5–14 mm; stamens 3–5 mm; anthers 0.4–1.3 mm; staminodia present; styles distinct, 1–3 mm; stigmas capitate. Capsules broadly ovate to subglobose, 4–6 mm diam., apex obtuse, segments persistent on plant, margins ciliate. Seeds 3–5 × 1.2–1.6 mm. 2n = 18.
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