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Stamens: 2 posterior fertile, perfect, included, filaments filiform; anther cells parallel, equal; 2 anterior reduced to minute staminodes.
Corolla bilabiate; tube short to long, often dilated at throat; upper lip bilobed, lower trilobed, all lobes spreading.
Leaves opposite, mostly small, closely arranged at base of stem; cauline leaves much reduced in size, few, distant.
Capsule ovoid or globose, small, loculicidally dehiscent, with 2 entire or bifid valves.
Flowers solitary in axils of upper leaves, occasionally cleistogamous.
Style short, often totally, or in part, persistent.
Annual herbs, erect, mostly glabrous.
Seeds small, numerous.
Calyx 5-lobed.
Ovules many.
