Shrubs, densely tomentose with non-glandular and inconspicuous glandular hairs. Leaves alternate, simple, entire, petiolate or almost sessile. Flowers solitary or clustered, axillary or terminal, bisexual, actinomorphic. Calyx campanulate to cupular, 5–lobed. Corolla campanulate to rotate; tube narrowly funnel-shaped or dilated, greenish-yellow, rarely whitish, striated; limb of 5 (sometimes 4 or 6) short, broad lobes, induplicate in bud, violet, rarely whitish. Stamens 5, equal or subequal, inserted at base of corolla-tube; anthers unilocular, not cohering, dehiscing by a semicircular slit. Ovary bilocular. Stigma capitate, very shortly bilobed. Fruit a smooth capsule, opening from apex by 4 valves, more or less enclosed by calyx. Seeds subreniform.
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