Annual to perennial herbs. Hairs glandular and/or eglandular, or 0. Lvs opposite, exstipulate, entire, narrow-lanceolate to linear-subulate. Infl. cymose, (1)-few- to many-flowered; bracts and sepals usually with scarious margins; epicalyx 0. Sepals 5, free. Petals 5, white, entire or slightly emarginate; coronal scales 0. Stamens 10 or fewer. Styles 3-(5). Fr. an oblong or narrowly ovoid capsule, often included in calyx, dehiscing by as many entire obtuse teeth as the styles; carpophore 0. Seeds (1)-many, smooth, tuberculate or fimbriate, not winged.