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Fruit dry, ± depressed-discoid, 10-locular, indehiscent, invested by the enlarged spiny tube of the calyx which develops a circular wing, and crowned by the marcescent calyx-lobes.
Calyx-tube cyathiform, concrescent with the carpels in fruit, surrounded by 2–3 series of inconspicuous spinules, ebracteolate; calyx-lobes 5, narrowly oblong-acute.
Carpels 10, verticillate; styles 10, free, persistent in fruit; stigmas capitate; ovule solitary, pendulous.
Low-growing annual herbs with somewhat woody stems, diffusely to densely branched, woolly-tomentose.
Petals 5, large, with convolute aestivation, inserted at the mouth of the calyx-tube, spreading.
Stamens 10, inserted with the petals; filaments filiform.
Flowers solitary, axillary, showy.
Seeds solitary in each locule.