Cotyledon is a genus of succulent plants in the family Crassulaceae. Mostly from Southern Africa, they also occur throughout the drier parts of Africa as far north as the Arabian Peninsula. Members of the genus are shrublets, generally succulent, with fleshily woody, brittle stems and persistent succulent leaves. The leaves are opposite. Leaf pairs generally are oriented at 90 degrees to their preceding and following pairs, as is common in the family Crassulaceae, but the leaf habit differs from say Tylecodon (in which the leaves are borne in spirals and are deciduous). Most plants in the genus, and those that used to be included in the genus Cotyledon, are poisonous, even dangerously so. Some have been implicated in stock losses among goats, pigs and poultry. However, many species have long been used in traditional medicine. They have been applied for many purposes, ranging from magic charms to removal of corns.

Cotyledon cuneata, synonymously known as Adromischus cuneatus, Cotyledon deasii, Cotyledon pillansii or Cotyledon undulata and commonly known as Krimpsiektebos in Afrikaans, is a South African endemic species found in the Eastern Cape, Northern Cape and Western Cape provinces. It is a perennial, decumbent, low growing shrub 30-75 cm in height with variably coloured flat leaves. The flowers of Cotyledon cuneata are yellow to yellow-green in colour during the summer and are cylindrical to areolate, as opposed to the tubular shape displayed by most species of Cotyledon. In addition, the whole plant, especially the flowers, exude a sticky substance. This does not only trap a lot of dust and sand particles, but also many insects which might otherwise have damaged the plant.