shrubs, branches slender, strict, terete. Leaves petiolate, narrowed at both
ends, stipulate, stipules triangular or oblong-ovate. Flowers small in axillary
spikes, bracteolate, white. Calyx tube ovoid, limb minute, 4-toothed,
persistent. Corolla funnel-shaped, throat villous, lobes 4, spreading, twisted
in buds. Stamens 4, anthers subsessile, linear, connective thickened at the
tip. Ovary 2-celled, styles filiform, branches linear, hairy, ovules 2-8,
pendulous from the top of each cell. Fruits small, 2-celled. Seeds imbricate.