Aylostera fiebrigii

Aylostera fiebrigii, the orange crown cactus or flame crown, is a species of flowering plant in the cactus family that is native to exposed rocky plateaux in the Bolivean Andes, at altitudes of above sea level. It consists of a solitary ball some in diameter, covered in tubercles and silky hairs, with brilliant orange daisy-like flowers. In time these balls multiply to form mounds.
A highly ornamental plant, this is a popular subject for cultivation in a well-drained, dry, sheltered location with plenty of sunlight, which does not freeze in winter.
Under the synonym Rebutia fiebrigii the cultivars 'Donaldiana', the pink-flowered 'Narvaecensis' which is also known as Aylostera narvaecense, and the smaller 'Muscula' which is also known as Aylostera muscula have gained the Royal Horticultural Society's Award of Garden Merit.