Plants 5-l20 cm tall, sometimes yellow-brown tomen-tose. Petiole 2-4 cm; leaf blade ovate or elliptic, 7-15(-22) × 4-8.5(-11) cm, papery, puberulent especially along veins, more so abaxially, base obtuse or slightly decurrent, margin entire or sinuate, apex acute. Flowers nodding. Pedicel 1-5 cm. Calyx campanulate to urceolate, 3-3.5 cm; ribs prominent, wavy, hirsute especially at base, apex sinuate or lobed; lobes short, sometimes unequal. Corolla pale yellow-green, ca. 3.5 cm, slightly exserted from calyx, pubescent adaxially and proximal to middle of tube abaxially, sometimes spotted adaxially; lobes slightly purplish, rounded. Filaments pubescent; anthers ca. 5 mm. Fruiting pedicel 2-2.5 cm, arching. Fruiting calyx twice as long as and enclosing capsule, ca. 5 cm; lobes indistinct, sometimes glabrescent. Fl. May-Aug, fr. Oct-Nov.
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