Oscularia deltoides, the deltoid-leaved dewplant, "dassievygie" or "sandsteenvygie", is a species of flowering succulent plant in the Aizoaceae family that is native to the south-western Cape, South Africa. This intensely flowering plant is found growing among sandstone rocks in the winter-rainfall mountains of the far south-western corner of South Africa. Growing to 30 cm (12 in) high and spreading indefinitely, it has silver-blue foliage. The fat, succulent leaves are three-sided (hence the qualifier deltoides - "triangular"), with red teeth on the margins. The stems are often tinged purple.