Sprawling, much-branched shrub, up to 1 m tall, with green stems becoming ± spine-tipped. Leaves alternate, rigid, with thickened, bluntly toothed margins. Flowers in a divaricately branched inflorescence, with peduncles becoming spinescent, corolla tube 2.5-3 mm long, ± as long as lobes, white, ovary inferior, ± hemispherical.
Like W. adpressa but stems much branched, to 1 m and inflorescence divaricately branched and becoming spinescent.