Capsule elliptic, thick woody walled, rather flattened parallel to the septum, dehiscing along the flat faces; valves warty, tomentose-greyish and at the end dark brown.
Flowers solitary or fascicled, axillary more or less dense in the uppermost part of the branches.
Ovary bilocular, ovoid surrounded by a cupular disk; ovules few, biseriate in each locule.
Calyx tubiform, shortly splitting at one side with 5(6) filiform lobes.
Anther-thecae connate in the upper part, free and parallel below.
Erect spiny shrub or small tree with dense grey woolly hairs.
Leaves opposite, often fascicled, simple.
Seeds many, papery winged.