Trichodiadema bulbosum (Schwantes 1926) A small shrub with erect branches that can reach just over 20 cm in height. It has a thickened root that may protrude from the soil. It features small leaves, typically clustered at the ends of the branches, and crowned by its characteristic crown of white, rigid, and sharp bristles, which may darken over time to become black. It produces small, solitary purple flowers. Etymology: From Latin, meaning "bulbous," referring to a bulb that appears only in a mutation of the species. They typically have a tuberous root.Place of Origin: Eastern Cape Province, South Africa.
Trichodiadema densum (Schwantes 1926) It forms a dense, stemless clump completely covered by leaves. These are thick and larger than in other species of the genus, each topped with the characteristic crown of spines. It is easy to cultivate. Purple-pink flowers appear in mid-winter. It has a thickened taproot that serves as a storage organ for resources. In its natural habitat, the bristles on the leaves act as moisture condensers, aiding survival in dry environments. Etymology: From the Latin densus, referring to its compact growth.Place of Origin: Cape Province, South Africa.