Perennials 80-100 cm tall. Taproot stout. Stems single, erect, robust, 1.2-2.5 cm in diam., angular. Leaves mostly basal, in a rosette; petiole flattened, 4-6 cm, base connate; leaf blade spatulate, 4-7 × 2.5-3.5 cm, base narrowed, apex rounded, veins 5-7, arcuate. Stem leaves in whorls of 4-6, sessile or short petiolate; leaf blade elliptic to ovate-elliptic, to ca. 12 × 3.5 cm, base narrowed to obtuse, apex acuminate, veins 5-7, arcuate. Inflorescences verticillasterlike, many flowered. Flowers 4merous, nodding. Pedicel to 6 cm, striate. Calyx lobes broadly elliptic to broadly ovate, 1-1.5 × 0.9-1.7 cm, base obtuse to subcordate and overlapping, apex rounded; veins 9-11, arcuate. Corolla pale yellow-green, with dark purple veins, campanulate, 3-3.5 cm in diam., tube 2-3 mm; lobes broadly obovate, 2-2.5 cm, margin irregularly crenulate, apex rounded to truncate. Nectaries 1 per corolla lobe, ovate-triangular, naked. Filaments 1.2-1.4 cm; anthers yellow, ellipsoid, 4-5 mm. Ovary ovoid-ellipsoid, 1-1.2 cm. Style indistinct; stigma lobes suborbicular. Capsules ovoid, 2.2-2.7 cm. Seeds dark brown, ellipsoid, ca. 2 mm, both ends winged. Fl. and fr. Jul-Sep.
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