Many, including: 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 2,100–4,000 m (6,900–13,100 ft) above sea level.

It consists of a solitary ball some 15 cm (5.9 in) in diameter, covered in tubercles and silky hairs, with brilliant orange daisy-like flowers.

In time these balls multiply to form mounds.

[2] 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',[3] the pink-flowered 'Narvaecensis'[4] which is also known as Aylostera narvaecense (Rebutia narvaecense),[5] and the smaller 'Muscula' ('Little Mouse')[6] which is also known as Aylostera muscula (Rebutia muscula)[7] have gained the Royal Horticultural Society's Award of Garden Merit.