Perennials 45-100 cm tall. Rhizomes blackish, short, with few slightly fleshy rootlets. Stems erect, striate, simple, base sheathed by blackish remains of old petioles. Basal and lower stem leaves alternate; petiole winged, 7-14 cm; leaf blade broadly elliptic, 8.5-11.5 × 6.5-8 cm, base truncate and decurrent into wings of petiole, apex obtuse to rounded, veins 5-7. Middle to upper stem leaves opposite; petiole short, connate; leaf blade elliptic, (3.5-)6-9 × 1.2-2.5 cm, both ends obtuse, veins 1-3. Inflorescences many-flowered thyrses 15-25 cm. Flowers 5merous. Pedicel 1.5-3 cm. Calyx lobes triangular-lanceolate, 6-8 mm, apex acuminate, veins 3. Corolla pale yellow, with blue spots, 1.5-1.8 cm in diam., tube 1.5-2 mm; lobes elliptic-lanceolate, 1.2-1.4 cm × 5-6.5 mm, apex obtuse. Nectaries 2 per corolla lobe, cupular, with pilose fimbriae 1.5-2 mm. Filaments flattened, 6-8 mm, base glabrous or fimbriate-barbate; anthers blue, narrowly ellipsoid, 2-2.5 mm. Style indistinct; stigma lobes suborbicular. Capsules ellipsoid to broadly ellipsoid, as long as persistent corolla. Seeds brown, compressed, suborbicular, 1-1.2 mm in diam., discoid winged. Fl. and fr. Jul-Sep.
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