Perennials 20-35 cm tall. Stems erect, slender, simple, glabrous. Basal leaves petiole 6-14 cm, membranous; leaf blade linear-lanceolate to linear-elliptic, 10-24 × 0.8-1.5 (-2.5) cm, base narrowed, margin scabrous, apex acuminate, veins 5-7. Stem leaves 4 or 5 pairs; petiole to 3 cm, membranous; leaf blade similar to those of rosette leaves, 3-10 cm × 6-10(-12) mm; upper leaves smaller and with shorter petioles; uppermost leaves sessile, spreading, surrounding flower cluster. Inflorescences crowded into terminal clusters, many flowered, sometimes also in few-flowered axillary whorls, subapical whorls rarely on pedunclelike branches. Flowers sessile. Calyx tube spathelike, 1.2-1.5 cm, membranous, split on 1 side; lobes 5, filiform, 1-2 mm. Corolla pale yellow, tubular-funnelform, 2.5-3 cm; lobes ovate, 4-5 mm, margin entire, apex acute; plicae triangular, 1.5-2.5 mm, oblique, margin dentate, apex acute. Stamens inserted at basal part of corolla tube; filaments 1-1.3 cm; anthers narrowly ellipsoid, 1.5-2 mm. Style 1.5-2 mm; stigma lobes linear. Capsules sessile, ovoid-ellipsoid, 1.8-2 cm. Seeds light brown, ellipsoid, 1.4-1.6 mm. Fl. and fr. Jul-Aug.
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