Like several of its close relatives (e.g. Fenestraria) and other plants in its ecotype (e.g. some species of Haworthia and Bulbine) has epidermal windows as an adaptation to the difficulties of photosynthesis in its arid environment.
They are summer-growing species, as their natural habitat lies in a summer-rainfall region. They grow in very well-drained, sandy soil, with repetitive light watering in summer and a dry environment in winter.
The genus contains the following species:
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