Stem slender, internodes 5-10 cm. Petiole flattened, 2-4 × 1-1.5 mm; leaf blade lanceolate to ovate-lanceolate, 3-7 × 0.5-1.5 cm, base narrowed, margin scabrous, veins 1-3. Inflorescences axillary or terminal, 1-flowered or in cymes; bractlets sometimes present, lanceolate. Pedicel 0.3-5 cm, slender. Calyx membranous; tube ca. 1 cm, wings 1-2 mm wide; lobes lanceolate, 4-7 × ca. 1 mm. Corolla blue, tube 1.1-1.5 cm; lobes oblong, ca. 8 × 3 mm, apex rounded. Stamens inserted at middle of corolla tube; filaments filiform, ca. 5 mm; anthers ovoid, ca. 2 mm. Style cylindric, ca. 2 mm; stigma lobes suborbicular. Fruiting pedicel ca. 5 mm; capsules ellipsoid, ca. 1.5 cm. Seeds brown, ellipsoid, ca. 1 × 0.7 mm; wings discoid, irregular. Fl. and fr. Aug-Sep.
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