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Stems erect or ascending, simple or branched, sometimes cushion-or mat-forming, becoming woody at base and into tap-root with crown often bearing many vegetative buds or not.
Filaments short, inserted near apex of tube; anthers unithecal by confluence, anterior pair smaller or sterile.
Stamens 4, didynamous or rarely 2 by abortion of anterior pair, posterior pair usually included.
Ovary bilocular; style filiform, entire, somewhat clavate at apex; ovules numerous.
Flowers in terminal spikes or occasionally axillary, bracteate.
Leaves opposite, or alternate above, simple, dentate or entire.
Annual or perennial herbs, subviscid, turning black on drying.
Calyx 5-toothed, bilabiate, oblong to tubular-ovoid.
Capsule ovoid-oblong, septicidally bivalved.
Seeds numerous.
