Unarmed annual or perennial herbs, occasionally shrubs, usually strongly glandular-viscid. Lvs alternate, simple, entire or nearly so, petiolate; basal lvs much larger than upper and often forming rosettes. Infl. a terminal panicle of open cymes, its branches well-developed, sometimes cymes elongated and appearing racemose. Fls usually pedicellate, sometimes nocturnal and then usually fragrant and pale. Calyx 5-toothed, tubular to subglobose, usually irregular, accrescent. Corolla salverform, funnelform or campanulate, white, pink, shades of red, or yellow, 5-lobed, sometimes oblique. Stamens 5, subequal, usually included. Stigma usually capitate, more rarely lobed. Fr. a capsule with 2 or 4 valves. Seeds small, numerous.