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Fls sessile or subsessile in the middle and upper axils, 1–several per axil, forming a dense or interrupted false spike, the lower fls cleistogamous, with reduced or abortive cor, the upper fls with normal, regular, wide open cor, the 5 lobes longer than the tube; cal-lobes 5, or only 3 or 4 in cleistogamous fls; stamens free, the short filaments expanded and ciliate at base; ovary mostly trilocular with axile placentas, varying to unilocular and with parietal placentas; stigma (2)3-lobed; capsules linear to ellipsoid or clavate, opening by pores at or usually above the middle; seeds numerous; annuals with toothed lvs. 8, mostly N. Amer.
