Fenestraria is a possibly monotypic genus of succulent plants in the family Aizoaceae, though the status of Fenestraria aurantiaca is under review to determine whether its proper status is that of a full species or a subspecies of Fenestraria rhopalophylla. There are various common names, such as babies' toes or window plant. Each leaf has a leaf window, a transparent window-like area, at its rounded tip, it is for these window-like structures that the genus is named (Latin: fenestra). In the wild, the plant commonly grows under sand, except for the transparent tips, which allow light into the leaves for photosynthesis. Fenestraria rhopalophylla is native to Namaqualand in southern Africa and to Namibia. The plants generally grow in sandy or calciferous soils under low < 100 mm rainfall.
F. rhopalophylla in flower
F. rhopalophylla appears very similar to Frithia pulchra, though the leaves are a slightly different shape and F. rhopalophylla has yellow flowers, compared to the pink flowers of F. pulchra.