Subshrubs or perennial herbs, glabrous. Rhizomes thick. Stems erect, terete or angled, di-or trichotomously branched. Leaves mostly paired, petiolate, entire. Inflorescences solitary flowers axillary or lateral on stems. Flowers nodding, 5-merous, zygomorphic. Pedicel elongate. Calyx tubular-campanulate or somewhat urceolate, slightly inflated, somewhat bent, 15-veined, with 5 main veins; lobes subequal. Corolla slightly zygomorphic, tubular-campanulate, twice as long as calyx, 15-veined; lobes subequal, quincuncial in bud. Stamens inserted in corolla tube, unequal, shorter than or equaling corolla; filaments pubescent at base; anthers dehiscing longitudinally. Disc ringlike, indistinctly lobed. Ovary 2-locular. Fruiting pedicel hardly thickened. Fruiting calyx inflated at base, contracted below apex but open, abruptly inserted on pedicel and easily detached from it after drying. Fruit a globose capsule. Seeds rectangular, somewhat compressed, netted.
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