Flowers 4-merous. Hypanthium broadly or narrowly campanulate, sometimes ribbed, pubescent with simple, branched, or glandular hairs, persistent and accres-cent in fruit. Calyx-tube not prolonged; sepals erect, triangular, acute, ciliate. Petals small, obovate, often ciliate. Stamens dimorphic. Filaments slender, flat, straight, glabrous. Anthers subulate to ovoid or obovoid; connective more or less prolonged below the thecae, often horizontal or arcuate, terminating in two small anterior appendages or lobes. Ovary free, oblong to cylindric, 4-celled, glabrous below, crowned with stiff erect setae surrounding the base of the straight slender style; stigma small, capitate. Capsule 4-valved, included by the hypanthium; seeds minute, cochleate, finely tuberculate. Erect, freely branched herbs, with ovate to linear leaves and cymose or glomerate, sessile or subsessile, pink or white flowers; hairs of the stem often geniculate or prolonged backward at base, those of the hypanthium often branched from the end of a conspicuous stipe.
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