Annual herb (3-)10–60 cm. tall, with slender hollow stems, simple and glabrous beneath, ± branched and glandular-pubescent above.. Leaf-blade lanceolate, 1–9 cm. long, 0.3–1.2 cm. wide, acute at the apex, cuneate at the base, glabrous; petiole 1–3 mm. long.. Inflorescences 5–15 cm. long, 4–13 cm. wide, glandular-pubescent on the axes, bracts and pedicels, etc.; inflorescence-branches 2.5–5 cm. long, bearing rather compact trichotomous cymes; pedicels 2–8(–12) mm. long.. Sepals lanceolate, 3–4.5 mm. long, 1 mm. wide, acuminate, glandular-pubescent.. Corolla blue; lobes elliptic-ovate, 3 mm. long, 2 mm. wide, rounded, glabrous.. Filaments 1.5–2 mm. long, filiform with a broadly ovate-triangular dilated base; anthers 1–1.3 mm. long with little-developed lobes.. Disk 1 mm. diameter.. Styles 0.7–1 mm. long.. Capsule globose-ovoid, 3–4 mm. long.. Fig. 1/1–8.
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