Shrubs, tomentose with non-glandular hairs or pubescent with mainly glandular hairs, or almost glabrous. Leaves alternate, simple, sessile, rarely petiolate. Inflorescence a cyme or raceme-, panicle-or thyrse-like, terminal or lateral; or flowers solitary, terminal, leaf-opposed, inter-foliar or in branch forks. Flowers bisexual, slightly zygomorphic, with or without subtending pairs of bracts. Calyx campanulate to cupular, 5–lobed. Corolla funnel-shaped to campanulate with spreading limb, white to pale yellow, striated in tube; limb 5–lobed, the lobes volutive in bud. Stamens 4, didynamous, inserted at base of corolla-tube; a staminode sometimes present; anthers unilocular, not cohering, dehiscing by a terminal, semicircular slit. Ovary bilocular; stigma capitate, very shortly bilobed. Fruit a smooth capsule, opening from apex by 4 valves, at least the lower half enclosed by calyx. Seeds subreniform.
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