Lianas; stems woody, perennial, tomentose when young, glabrescent. Leaves ovate, oblong to ovate-oblong, 5-12(-15) cm long, cordate to obtuse basally, acute, obtuse, attenuate to obtuse-mucronate apically, glabrous or less commonly sparsely pubescent above, tomentose to glabrate beneath. Flowers in axillary cymes or terminal thyrses, few-to many-flowered; sepals orbicular to orbicular-ovate, 5-7 mm long, the outer sepals ferrugineous to pubescent-glabrescent, the inner sepals sparsely pubescent to glabrate; corollas white, 1-2 cm long, inter-plicae hirsute; styles shortly connate basally, the stigmas 2, globose or capitate and commonly subbilobate. Fruits capsular, ovoid to subconical, 8-15 mm in diameter; seeds ovoid, brown, comose at least on the margins.
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