Linum usitatissimum

Herbs, annual, 20–100 cm, glabrous or glabrate throughout. Stems erect, unbranched or few-branched at base (all flowering). Leaves divergent; blade linear to linear-lanceolate, 10–40 × 1.5–5 mm. Inflorescences open panicles. Pedicels erect in fruit, to 20–25 mm. Flowers homostylous; sepals ovate, 6–9 mm, margins of inner sepals minutely ciliate, outer ciliate, apex acuminate; petals usually blue, rarely white, obovate, 10–15 mm; stamens 5–7 mm; anthers 1–1.5 mm; staminodia present; styles distinct or connate at base, 3–6 mm; stigmas linear or clavate. Capsules ovoid to subglobose, 6–10 × 5–10 mm, apex rounded, dehiscing incompletely, segments falling freely, margins ciliate or not. Seeds 4–6 × 2.5–3 mm. 2n = 30.

Water moderately, allowing the top 3cm to dry out between watering.

Linum Usitatissimum

Linum usitatissimum

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