Perennial herbs and subshrubs, unarmed, terrestrial, unbranched, with adventitious roots, without raphides in the tissues, densely hirsute to sericeous. Leaves opposite and often clustered near base, petiolate, entire, with higher-order venation not lineolate, without domatia; stipules interpetiolar and fused to petioles, ovate and shortly bifid, well developed, erect and perhaps imbricated in bud, persistent. Inflorescences axillary, subcapitate to shorty cymose, few- to several-flowered, pedunculate with the peduncles elongated and sometimes bearing foliaceous bracts along their length, bracteate. Flowers subsessile, bisexual, apparently homostylous, apparently protandrous, medium-sized and showy, perhaps fragrant and diurnal; hypanthium turbinate; calyx limb well developed, 4-lobed, without calycophylls; corolla salverform, pink, internally glabrous except sparsely to moderately puberulous-pilosulous with stout trichomes in throat and/or on bases of lobes, lobes 4, ovate and rounded, in bud imbricated, without appendage; stamens 4, inserted near base of corolla, anthers narrowly ellipsoid, basifixed, opening by linear slits, without appendage, included; ovary 2-locular, with ovules numerous in each locule, on axile placentas; stigmas 2, linear-oblong, included. Fruit capsular, subglobose to oblate, loculicidal through apical pore in disk area, leathery, somewhat small (ca. 0.8 cm diam.), smooth, with calyx limb persistent; seeds numerous, subglobose, small (0.3-0.4 mm long), foveolate.