Perennials 10-25 cm tall. Roots to 25 × 1.5 cm. Stems ascending to erect, slender, simple, glabrous. Basal leaves petiole 3-6 cm, membranous; leaf blade linear, rarely broadly linear, 4-14 × 0.8-1(-2.5) cm, base narrowed, margin scabrous, apex acuminate, veins 3-5. Stem leaves 2-5 pairs; petiole to 2 cm, membranous; leaf blade linear, 3-8 cm × 3-9 mm, base obtuse, margin scabrous, apex acuminate, veins 1-3. Inflorescences crowded into terminal clusters, many flowered, rarely also in few-flowered axillary whorls; axillary whorls sessile, rarely on pedunclelike branches. Flowers sessile. Calyx tube 4-6 mm, sometimes split on 1 side; lobes 5, filiform to subulate, 1-3.5 mm, unequal. Corolla dark blue-purple, tubular-campanulate to funnelform, 2.3-2.6 cm; lobes oblong, 3.5-4 mm, margin entire, apex rounded; plicae triangular, 2.5-3 mm, oblique, margin entire or 2cleft, apex acute. Stamens inserted at basal part of corolla tube; filaments 1.1-1.4 cm; anthers ellipsoid, 1.5-2.5 mm. Style 2-3 mm; stigma lobes oblong. Capsules sessile, narrowly ellipsoid to ellipsoid, 1.4-1.7 cm. Seeds brown, ellipsoid, 1.1-1.5 mm. Fl. and fr. Jul-Sep.
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