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Leaves all radical and resetted, or sometimes also cauline and opposite or uppermost alternate, entire or dentate.
Erect, annual or perennial herbs or rarely undershrubs, glabrous to variously pubescent.
Flowers several to numerous, pedicellate or subsessile, bracteate or ebracteate.
Inflorescence terminal, racemose, spicate or compound, thyrsoid or paniculate.
Corolla 5-lobed, lobes subequal; tube slender, rarely dilated at throat.
Style filiform, included or slightly exserted, stigma subclavate.
Ovary bilocular, ovules numerous.
Calyx 5-lobed.
Seeds rugose.
