Rebutia padcayensis was first described by Walter Rausch in Kakteen und andere Sukkulenten 21(4): p. 65, 1970, the journal of the Deutsche Kakteen-Gesellschaft.

Here is the text of the description in Latin as published, together with my own English translation below. You should look up the original for more details in German and black-and-white photographs.

Rebutia (Aylostera) padcayensis Rausch spec. nov.

Walter Rausch

Simplex ad proliferans, late-globosa, ca. 25 mm alta et ad 40 mm diametiens, laeteviridis ad glauca; costis 14 – 16, in gibberes pianos, 6 mm longos et latos dissolutis, spiraliter tortis; areolis rotundis ad ovalibus, 1 mm diametientibus, albo ad fusco-tomentosis; aculeis marginalibus 12 – 14, 5 – 12 mm longis, accumbentibus, circa corpus contextis, setosis, ochroleucis fusco-acuminatis, postea canescentibus; aculeo centrali nullo. Floribus 35 mm longis et diametientibus; ovario et receptaculo flavido-roseo squamis viridibus nudis, raro setis 1 – 2 indutis tecto; phyllis perigonii exterioribus rubris medio-viridistratis; phyllis perigonii interioribus spathulatis, cuminatis, rubris basin versus albis; filamentis luteis imo albis; stylo ca. 14 mm cum receptaculo connato, albo; stigmatibus (4) albis; fructu late-globoso, 4 mm diametiente, fusco, squamis 1 mm latis, viridibus, nudis, raro setis 1-2 indutis tecto; seminibus testa verruculosa, nigra et hilo albo instructis.

Patria: Bolivia, a Padcaya in occidentem versus, 2400 – 2900 m alt. (Cara del diablo).

Typus Rausch 322 in Herbario (Naturhistorisches Museum Wien)

English translation

Rebutia (Aylostera) padcayensis Rausch spec. nov.

Walter Rausch

Solitary to branching, broadly spherical, approx. 25 mm high and up to 40 mm diameter, fresh green to greyish; ribs 14-16, twisted spirally into flat tubercles 6 mm long and wide; areoles round to oval, 1 mm diameter, with white to brown wool; 12 – 14 Marginal spines, 5 – 12 mm long, lying close, woven around the whole body, bristly, pointed yellowish-white to brown, later greying; no central spines; flower 35 mm long and the same wide; ovary and tube yellowish-pink with green, hairless scales, rarely bearing 1 – 2 bristles; outer petals red with green central stripes; inner petals spatulate with a tapering tip, red with a white throat; stamens yellow with white base; style approx. 14 mm fused with the tube, white; stigmas (4) white; fruit broadly round, 4 mm in diameter, brown with 1 mm wide, hairless, green scales, rarely with 1 – 2 bristles; seed with fine black skin and white hilum.

Habitat: Bolivia, west of Padcaya at an altitude of 2400-2900 m (Cara del diablo).

Type: Rausch 322 deposited in the Herbarium of the Natural History Museum of Vienna.