Perennials 25-35 cm tall. Roots 0.9-1.2 cm in diam. Stems ascending, slender, simple, glabrous. Basal leaves petiole 3-4.5 cm, slender, membranous; leaf blade linear-lanceolate, linear-elliptic, or oblanceolate, (5-)8-13 × 0.8(-2.2) cm, base narrowed, margin scabrous, apex obtuse, veins 3-5. Stem leaves 2 or 3 pairs; petiole to 3.5 cm, shorter toward stem apex, membranous; leaf blade linear to linear-elliptic, 2.5-9 × 0.4-1.5 cm, base obtuse, margin scabrous, apex acuminate to obtuse, veins 1-3; 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 6-13 mm, membranous, usually split on 1 side; lobes 5, linear to dentiform, (2-)3-4 mm, unequal. Corolla pale yellow, sometimes with brown spots in throat, tubular-funnelform, (2.5-)3-3.5 cm; lobes ovate-oblong, 4-5 mm, margin entire, apex obtuse; plicae lanceolate, 2-2.5(-3.5) mm, slightly 2cleft. Stamens inserted at middle of corolla tube; filaments 0.9-1.1 cm; anthers narrowly ellipsoid, 1-2 mm. Ovary ellipsoid, 1.3-1.5 cm; gynophore 0.9-1.1 cm. Style 1-1.5 mm; stigma lobes oblong. Fl. Aug-Oct.