Shrubs or trees with minute cystoliths. Shoots articulated, obtusely quadrangular, robust. Leaves opposite, petiolate; blades, ovate to oblong, subcoriaceous, margin entire to undulate. Inflorescences dense, terminal, many-flowered panicles or corymbs, flowers arranged in triads; bracts small, central flower of each triad ebracteolate and lateral flowers subtended by 2 triangular bracteoles at base of calyx; pedicels about as long as bracts. Flowers conspicuous, distally densely pubescent; calyx campanulate, deeply 5-lobed, lobes subequal to equal in size, mostly obtuse apically; corolla campanulate, densely silky or tomentose, lower half of tube cylindric, gradually enlarged upwards, limb regular, 5-lobed, lobes red proximally, yellowish distally, red within, subequal, triangular, contorted in bud; stamens 4, didynamous, inserted in middle of corolla tube, exserted from mouth of corolla, filaments united into pairs at base, anthers 2-thecous, thecae equal in size, parallel, introrsely ciliate in a longitudinal line, obtuse or rounded at both ends, staminodes 0; disk annular; ovary with 3 or 4 ovules in each locule, stigma 2-lobed, upper lobe rudimentary, lower lobe oblong. Capsules estipitate, ellipsoidal, pubescent, retinacula present, septae with attached retinacula remaining attached to inner capsule wall; seeds 4, 2 in each locule, lenticular.
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Shrubs or trees. Leaves ovate to oblong, entire to undulate, numerous small cystoliths visible on the upper surface. Inflorescences in compact terminal panicles (or corymbs). Flowers subtended by 2, small, triangular bractlets; calyx 5-merous with the sepals separate, equal and mostly obtuse; corolla regular, 5-lobed, tomentose, campanulate; stamens 4, exserted, didynamous, the anthers ciliate, with 2 equal cells rounded at the base; capsule 4-seeded.
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