Perennials 70-100 cm tall. Rhizomes blackish, short, with few slightly fleshy rootlets. Stems erect, robust, striate, simple, base sheathed by blackish remains of old petioles. Basal and lower stem leaves long petiolate; petiole flattened, 5-13 cm, base connate; blade broadly elliptic, 17-31 × 5-9 cm, base narrowed, apex obtuse, veins 7-9. Middle to upper stem leaves many pairs, sessile or short petiolate; leaf blade ovate-lanceolate to ovate, 3-10 × 0.7-4 cm, base obtuse, apex acute to obtuse, veins 3-7. Inflorescences narrow, dense, interrupted, many-flowered thyrses ca. 25 cm. Flowers 5merous. Pedicel spreading to erect, to 3 cm, robust. Calyx lobes ovate-lanceolate, 1.1-1.3 cm, margin sparsely serrulate, apex acute. Corolla pale yellow-green, with blue streaks, 2-2.5 cm in diam., tube 1.5-2 mm; lobes oblong to obovate-oblong, 1.5-1.7 cm, apex obtuse to rounded and erose. Nectaries 2 per corolla lobe, cupular, with pilose fimbriae 2-3 mm. Filaments 8-10 mm; anthers blue, ellipsoid, 3-3.5 mm. Style indistinct; stigma lobes suborbicular. Capsules cylindric to ovoid, 1-1.8 cm. Seeds brown, longitudinally rugose. Fl. Aug-Sep.
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