Herbs. Leaves entire, usually and prominently lineolate. Flowers
in dense terminal or axillary, bracteate 1-sided spikes. Bracts usually in 2-4
rows, 2 of the rows barren, usually with scarious hyaline margin, bracteoles
similar to the bracts or narrow. Calyx 5-partite. Corolla 2-lipped. Stamens 2,
anther 2-celled, ovules 2 in each cell, styel filiform, stigma minutely bifid.
Capsule ovoid or oblong, placentas and retinacula elastically separating from
the base after dehiscence. Seeds 4, compressed, orbicular.