Digitorebutia (Aylostera) nazarenoensis was first described in Succulenta 58(8) p. 186, by Walter Rausch in 1979.

Here is the text of the description in Latin as published, followed by my own English translation. You should look up the original for additional notes in Dutch plus a colour photograph.

Digitorebutia nazarenoensis Rausch spec. nova

Walter Rausch

Simplex vel paulum proliferans, globosa, ad 3 cm diametiens, glauca, radice rapiformi; costis recte adscendentibus vel paulum tortis, sulcis transversis in gibberes 3-4 mm longos divisis; areolis ovalibus, fusco-tomentosis; aculeis marginalibus 10-12 et 1 deorsum directo, ad 6 mm longis, accumbentibus, vitreo-albis; aculeo centrali 1, ad 5 mm longo, fusco. Floribus 30 mm longis et 35 mm diametientibus; ovario et receptaculo, albido-roseo, squamis fuscis, perpaucis setis et lana alba tecto; phyllis perigonii exterioribus rotundis, tenui-acuminatis, albido-roseis, medio-fusco-striatis; phyllis perigonii interioribus rotundis et serratis, aurantiacis; fauce 20 mm longa, dimidiata cum stylo connata, albida; filamentis albidis, stylo et stigmatibus viridibus. Fructu seminibusque Digitorebutiae modo.

Patria: Argentina, Santa Victoria, prope Nazareno, 3.350 m alt.

Typus: Rausch 484, depositus in Herbario Collectionis Plantarum Succulentarum Municipali Turicensi, Helvetia.

English translation

Digitorebutia nazarenoensis Rausch spec. nova

Walter Rausch

Single or branching a little, spherical, up to 3cm in diameter, glaucous, with a tap root; ribs straight or slightly spiralling, with horizontal grooves between tubercles 3 – 4 mm long; areoles oval, with brown wool; 10 – 12 marginal spines and 1 pointing downwards, up to 6 mm long, flattened, glassy white; 1 dark central spine, up to 5 mm long. Flowers 30 mm long and 35 mm wide; ovary and receptacle whitish-pink, with dark scales, only a few bristles and white wool; outer petals round with a small point, whitish-pink with a darker central stripe; inner petals round and serrated, orange; throat 20 mm long, half of which connected to the style, white; stamens white, syle and stigmas green. Fruit and seeds as for other Digitorebutia.

Habitat: near Nazareno, Santa Victoria, Argentina, at 3,350 m altitude.

Type: Rausch 484, deposited at the Herbarium of the Municipal Succulent Plants Collection of Zurich, Switzerland.