The original description of Rebutia (Aylostera) colorea was published in Kakteen und andere Sukkulenten 28(4): 76, 1977, the journal of the Deutsche Kakteen-Gesellschaft, by Friedrich Ritter.

Here is the text, but you should look up the original description for more details.

Rebutia colorea Ritter spec. nov.
Solitaria, 1-2 cm crassa, obscure olivacea, radice crassa rapacea; costae 9-11, 2-3 mm altae, crenatae; ariola 1-1,3 mm longae, subnudae, 2-3 mm inter se remotae; spinae 6-8, solum marginales, pectinatae, 1,5-2,5 mm longae, luridae.
Flores 25-35 mm longi, profunde laterales; ovarium lana exigua alba et saepe saetis instructum; stylus 2,5-5 mm cum tubo coalitus; sulcus nectarifer 1-2 mm longus; tubus floralis 5-7 mm longus, interne rosipurpureus; filamenta, purpurea, sine lacuna; stylus el 4-7 stigmata viridia ; petala 10-16 mm longa, 4-6 mm lata, subspathulata, carminea ad purpurea (colore 8 ad 9, culmine et basi 10); semina 1 mm longa, fere levia; habitat San Antonio, Prov. Mendez, Bolivia.
Collected as FR 1106.