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Herbs, biennial or short-lived perennial (flowering 1st year), 6–60 cm, glabrous. Stems erect, usually branched from near base and in inflorescence. Leaves: blade linear to linear-lanceolate, 5–25 × 1–1.5 mm. Inflorescences open panicles. Pedicels 10–25 mm. Flowers homostylous; sepals ovate, 4–5.5 mm, margins of inner sepals minutely ciliate, outer glabrous, apex acute to acuminate; petals blue, obovate, 6–10 mm; stamens 4–5 mm; anthers 1–2.5 mm; staminodia present or absent; styles distinct, 2 mm; stigmas linear or clavate. Capsules broadly ovate to subglobose, 4–6 × 4–6 mm, apex very sharp-pointed, segments ± persistent on plant, margins ciliate. Seeds 2.5–3 × 1.5–2 mm. 2n = 30.
Glabrous biennial, sometimes annual or shortly lived perennial, to 1 m high. Leaves alternate, narrow-lanceolate to linear, 8–25 mm long, acute, sessile. Flowers solitary, terminal or axillary; pedicels 8–22 mm long. Sepals elliptic, 4.5–5 mm long, acuminate. Petals obovate, 7–12 mm long, pale blue with darker blue venation. Anthers blue. Styles connate for much of their length. Capsule 5–6 mm diam. Seeds 3–3.2 mm long, brown.
A herb. It keeps growing from year to year.
