Crassula expansa subsp. fragili is a delicate, untidy, sprawling perennial (or also annual) succulent herb with thin red-brown stems. Its small obovate leaves are hairy or glabrous, with hydathodes scattered on the upper surface. The small tubular white to mottled red flowers are borne in terminal clusters. This taxon shows a wide range of variation particularly in the size and shape of the vegetative organs. Plants vary from densely tomentose to glabrescent, the leaves vary from strongly dorsiventrally compressed to somewhat convex on both surfaces and pedicels elongate in some forms more than in others.Derivation of specific name: The specific and subspecific epithets, taken from the Latin “expansa”: expanding, spreading and “fragilis”: delicate, fragile, brittle.Stems: Stems several from a short woody base, up to c. 25 cm long, often purple-brownish below, herbaceous and green above, growing from a short, woody base. Subdichotomously branched, slender, usually puberulous or hispid everywhere (hairs acute, hyaline, spreading, denser and longer above), or sometimes glabrous towards the base, or rarely papillose-puberulous; internodes variable in length, often longer than the leaves.