Rebutia donaldiana fiebrigii
(This plant comes in a 3.5" pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
Description: Rebutia fiebrigii is a small solitary or mound-forming cactus preading out to 15 cm with white, silky, short spines and light green tubercles thickly covering the body. It is a free-flowering species with bright vermilion blooms, but quite variable.
Flowers: Flowers produced halfway up the stems, curving upward, yellow, bright orange or vermilion red, funnel-shaped, 25-45 mm long, 4 cm diameter. Tube narrow 10-18 mm long, outside pale greenish to reddish, inside pale. Ovary spherical, about 4 mm wide, with small triangular scales with few white wool few white bristly hairs. Tepals vermilion red, rather rounded, often slightly serrated, 14-16 mm long, 4-6 mm wide. Filaments white, anthers golden yellow. Pistil white, with 5-6 white stigma lobes 2-3 mm long, slightly protruding the anthers.
Blooming season: Flowers all tend to come in one late Spring rush, rather than spread over the Summer, and remain open for up to six days.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz