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Stamens 4, didynamous, exserted; filaments filiform inserted on corolla tube, glabrous.
Leaves opposite, or alternate especially above, entire to serrate or dentate.
Calyx 5-lobed, shallowly or deeply-cleft, or appearing bilabiate.
Capsule oblong, ovoid or subglobose, subcompressed, obtuse.
Annual, or more rarely perennial, herbs, sub-viscid-pilose.
Bracts adnate below to pedicel and or base of calyx.
Flowers usually spicate, small, unibracteate.
Ovary bilocular, ovules numerous.
Style filiform, exserted.
