Herbs, unbranched; stems terete to quadrangular, pilosulous. Leaves opposite, distributed along stems; petiole 1-3 cm; blade drying black-brown, ovate, narrowly elliptic, or rarely obovate, 8-15 × 2.5-4.5 cm, adaxially glabrescent to pilose, abaxially villous, base cuneate, margins entire or serrulate-ciliolate, apex acuminate; secondary veins 5-7(or 8) pairs; stipules suborbicular, 4-5 mm, usually reflexed, villous abaxially and marginally. Inflorescences terminal, cymose, densely many flowered; peduncles shorter than 1 cm; pedicels 3-3.5 mm. Flowers pedicellate. Calyx densely multicellular villous; hypanthium portion obconic, 3.5-4 mm; limb deeply lobed; lobes subtriangular, ca. 1.5 mm, obtuse. Corolla white or bright yellow, tubular-salverform, densely multicellular villous outside; tube 14-16 mm, white villous inside; lobes subelliptic, 4-6 mm, obtuse. Capsules obconic or subglobose, pilose, weakly shiny. Fl. summer.
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