Perennials 10-30 cm tall. Roots to 20 × 1.5 cm. Stems ascending, simple, glabrous. Basal leaves petiole 2-3 cm, membranous; leaf blade elliptic-lanceolate to ovate-elliptic, 8-23 × 2-4.5 cm, base narrowed, margin scabrous, apex acuminate, veins 3-5. Stem leaves 3-5 pairs; petiole ca. 2 cm, shorter toward apex, membranous; leaf blade lanceolate, 3.5-6.5 × 0.7-1.7 cm, base obtuse, margin scabrous, apex acuminate, veins 1-3; uppermost leaves sessile, spreading, surrounding flower cluster. Inflorescences crowded into terminal clusters, many flowered, sometimes also in few-flowered axillary whorls rarely subapical on pedunclelike branches. Flowers sessile. Calyx tube 1.2-2 cm, membranous, split on 1 side; lobes (3-)5, filiform, 0.5-5 mm, unequal. Corolla yellow-white, greenish white, or yellow-green, tubular-campanulate to campanulate, 3-3.5 cm; lobes ovate to ovate-triangular, 5-6 mm, margin entire, apex acute to obtuse; plicae triangular to truncate, 2-2.5 mm, oblique, margin denticulate. Stamens inserted at basal part of corolla tube; filaments 1-1.3 cm; anthers narrowly ellipsoid, 2.5-3 mm. Style 2-2.5 mm; stigma lobes oblong. Capsules ovoid-ellipsoid, 1.8-2 cm; gynophore 2-3 mm. Seeds dark brown, narrowly ellipsoid, 1.5-1.7 mm. Fl. and fr. Jul-Oct.
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