Dioecious shrubs or undershrubs, pubescent with non-glandular and glandular hairs. Leaves alternate, simple, sessile. Flowers solitary or in 2–3–flowered cymes, terminal or on short lateral branches, slightly zygomorphic, subtended by pairs of opposite bracts. Calyx campanulate to cupular, 5–lobed. Corolla narrowly tubular with erect or spreading limb, white with purple striations in tube; limb 5–lobed, the lobes short, volutive in bud. Stamens 4 or 5, occasionally 3, equal, inserted at base of corolla-tube; a staminode sometimes present; anthers bilocular, cohering, dorsifixed, dehiscing by longitudinal slits. Ovary bilocular. Stigma capitate, very shortly bilobed. Fruit a smooth capsule, opening from apex by 4 valves, more or less enclosed by calyx. Seeds ellipsoid.
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