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Leaves opposite or nearly so, entire, filiform or pinnatisect with filiform segments.
Fruit capsular, more or less distinctly rostrate, vertically somewhat compressed.
Inflorescence racemose, of ten obscurely so, with opposite, leaf-like bracts.
Erect, slender, annual herbs, simple-stemmed to branched, glabrous, smooth.
Corolla 5-lobed, long tubular, lobes equal or subequal.
Ovary bilocular, ovoid or globose; ovules numerous.
Seeds numerous, cylindric or obovoid.
Flowers pedicellate, bibracteolate.
Calyx 5-lobed.
