From the Greek aptena—without wings; referring to the wingless capsule valves.

Succulent prostrate papillose perennial herbs with angular branches. Leaves in opposite equal pairs, base cordate. Flowers with sepals 4 in opposite unequal pairs, stamens and sterile stamens purplish red. Ovary 4-chambered; ovule placentation axile.

2 species from S Africa (1 species naturalised in Australia).

Source: Spencer, R.; Thompson, A. (1997). Aizoaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.